Thông tư 02/2021/TT-BXD

Thông tư 02/2021/TT-BXD QCVN 06:2021/BXD Quy chuẩn kỹ thuật quốc gia về An toàn cháy cho nhà

Nội dung toàn văn Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions

MINISTRY OF CONSTRUCTION -------	SOCIALIST REPUBLIC OF VIETNAM Independence – Freedom – Happiness ----------------
No. 02/2021/TT-BXD	Hanoi, November 19, 2021

CIRCULAR

ISSUANCE OF QCVN 06:2021/BXD ON NATIONAL TECHNICAL REGULATIONS ON FIRE SAFETY FOR BULDINGS AND CONSTRUCTIONS

Pursuant to Law on Standards and Technical regulations dated June 29, 2006;

Pursuant to Decree No. 74/2018/ND-CP dated May 16, 2018 of Government on amendment to Law on Technical Standards and Regulations and Decree No. 78/2018/ND-CP dated May 16, 2018 of the Government on amendment to Decree No. 127/2007/ND-CP;

Pursuant to Decree No. 81/2017/ND-CP dated July 17, 2017 of the Government on functions, tasks, powers, and organizational structure of the Ministry of Construction;

At request of Director General of the Department of Science Technology and Environment,

Minister of Construction promulgates Circular on National Technical Regulations on Fire Safety for Buildings and Constructions.

Article 1. QCVN 06:2021/BXD on National Technical Regulations on Fire Safety for Buildings and Constructions is attached hereto.

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Article 3. Ministries, ministerial agencies, Governmental agencies, People’s Committees of provinces and central-affiliated cities and relevant organizations, individuals are responsible for the implementation of this Circular./.

PP. MINISTER
DEPUTY MINISTER

Le Quang Hung

QCVN 06:2021/BXD

NATIONAL TECHNICAL REGULATIONS ON FIRE SAFETY FOR BULDINGS AND CONSTRUCTIONS

TABLE OF CONTENTS

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2. FIRE-RELATED CLASSIFICATION

3. HUMAN SAFETY ASSURANCE

4. FIRE SPREAD PREVENTION

5. WATER SUPPLY FOR FIREFIGHTING

6. FIREFIGHTING AND RESCUE

7. REGULATIONS ON MANAGEMENT

8. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

9. ORGANIZATION FOR IMPLEMENTATION

Annex A: Additional regulations on fire safety for specific groups of buildings

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Annex C: Classification of buildings and rooms based on fire hazard characteristics

Annex D: Regulations on smoke protection for buildings and constructions

Annex E: Requirements for fire safety distance between buildings and constructions

Annex F: Norm fire-resistance rating of certain structures and components

Annex G: Regulations on distance to emergency egress and width of emergency egress

Annex H: Regulations on maximum number of storey (maximum fire service height) and fire compartment area of buildings

Annex I: (reference) Illustrations of regulations

Preface

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QCVN 06:2021/BXD replaces QCVN 06:2020/BXD attached to Circular No. 01/2020/TT-BXD dated April 6, 2020 of Minister of Construction.

NATIONAL TECHNICAL REGULATIONS
ON FIRE SAFETY FOR BULDINGS AND CONSTRUCTIONS

1. GENERAL PROVISIONS

1.1 Scope

1.1.1. These Regulations prescribe general provisions regarding fire safety for rooms, buildings and constructions (hereinafter referred to as “buildings”) mandatory for application throughout new construction, renovation, repair, or repurposing, and mandate technical regulations for buildings, parts and components thereof, rooms, construction components and materials.

1.1.2. Sections 3, 4, 5, and 6 hereof do not apply to buildings with specific purposes (buildings for manufacturing or preserving explosive substances and materials; storage of petroleum, petroleum products, natural gas, flammable gas, and spontaneous combustible substances; buildings for manufacturing or storing toxic chemical substances; national defense structures; underground sections of subway structures; mining structures; and buildings with similar characteristics).

1.1.3. Section 5 hereof does not apply to: facilities, buildings, and structures for storing and preserving cereal; gas stations; energy facilities (thermal power stations, hydroelectricity stations, boiler facilities providing heat, wind turbine power stations, diesel and steam power stations, grid-connected electricity facilities).

1.1.4. Section 5 hereof does not apply to firefighting systems employed for metal fires as well as strong chemically active substances and materials which, upon reacting with water, cause explosion, create flammable gas, release heat intensively, such as: compounds of aluminum and organic materials, alkali metal, compounds of lithium and organic materials, lead azide, aluminum hydrides, zinc hydrides, sulfuric acid, titanium chloride, thermal aluminum.

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In addition to application of these Regulations, requirements for fire safety and prevention elaborated under other standard documents applicable to each building and construction must be complied with. If elaborating standard documents according to these Regulations have not been issued, may use specific regulations in applicable standards until such standards are reviewed, may use applicable standards of foreign countries on the basis of complying with these Regulations and Vietnamese regulations and law on fire prevention, firefighting, and regulations on application of foreign standards in construction affairs in Vietnam.

In case of discrepancy between these Regulations and other regulations in terms of fire prevention and firefighting for buildings and constructions, these Regulations shall prevail.

1.1.6. Design documents and technical documents of buildings, components, structures, and construction materials must specify fire technical characteristics of said buildings, components, structures, and construction materials according to these Regulations.

1.1.7. When designing and constructing buildings and constructions, in addition to these Regulations, other regulations and mandatory technical requirements must be complied with as per applicable law such as: planning, architecture, structure, water supply and drainage systems, electrical systems, electrical equipment, lightning arrester, fuel supply system, fuel efficiency systems, air ventilation system, air conditioning systems, mechanical issues, glass safety, fall and collision prevention.

1.1.8. For buildings or constructions for manufacturing products and commodities with fire hazard commodities of F5.1 and F5.2 according to 2.6.5. (excluding parking lots for automobiles, motorbikes, and bicycles that do not provide technical and repair services) having no more than 1 basement (also known as “industrial building”), in addition to complying with these Regulations, regulations on fire safety under A.1 of Annex A must also be complied with.

1.1.9. For buildings with fire hazard categories by function of F1.2, F4.3 and multipurpose buildings having fire service height from exceeding 50 m to 150 m (no more than 3 basements), buildings with fire hazard categories by function of F1.3 having fire service height from exceeding 75 m to 150 m (no more than 3 basements), in addition to complying with regulations under Sections 2, 3, 4, 5, 6, 7, 8, and 9, additional corresponding regulations on fire safety under A.2 and A.3 of Annex A must be complied with.

NOTE: Hospitals and formal education institutions may only situate primary functions as low as semi-basement or the first basement (in case semi-basements are not available). The first basement refers to the topmost basement or the basement adjacent to the semi-basement.

1.1.10. For buildings that do not have fire prevention and firefighting and buildings with fire hazard categories by function of F1.2, F1.3, and F4.3 and multipurpose buildings having fire service height taller than 150 m or having more than 4 basements, and particularly complicated or irregular buildings, in addition to complying with these Regulations, add further technical requirements and solutions regarding organizations and construction technical issues satisfactory to fire prevention and firefighting characteristics of said buildings on the basis of applicable standard documents. These requirements and solutions must be approved by competent Vietnam Fire and Rescue Police Department.

1.1.11. In specific circumstances, Ministry of Construction only permits changes to requirements hereof for certain constructions when the Ministry receives explanation on additional or alternative solutions, or full basis of calculation to guarantee fire safety for these constructions. This explanation must be approved by Vietnam Fire and Rescue Police Department prior to being submitted to Ministry of Construction.

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1.1.13. For individual houses for households no taller than 6 storeys or having no more than 1 basement, may not comply with these Regulations but rather comply with separate and suitable guidelines for specific houses and residence areas.

In case of repurposing, comply with these Regulations and receive approval of competent Fire and Rescue Police Authorities similar to constructions with fire safety design that requires approval.

1.2. Regulated entities

These Regulations apply to organizations and individuals related to investment for construction, management and use of civil buildings and industrial buildings in Vietnam.

1.3 Reference documents

Reference documents below are necessary for adoption of these regulations. If the referred documents are revised or replaced, the latest version shall prevail.

TCVN 3890:2009, Fire safety and firefighting equipment for buildings and constructions. Equipment, distribution, inspection and maintenance.

TCVN 9310-4:2012, Fire safety and fire prevention – Lexicon – Part 4: Fire-fighting facilities.

TCVN 9310-8:2012, Fire safety and fire prevention – Lexicon – Part 8: Terminology in firefighting, rescue and handling of dangerous materials.

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TCVN 9311-3:2012, Fire resistance experiment – Building components - Part 3: Guidelines for experiment methods and application of experiment figures.

TCVN 9311-4:2012, Fire resistance experiment - Building components – Part 4: Specific requirements for vertical load-bearing separating components.

TCVN 9311-5:2012, Fire resistance experiment - Building components – Part 5: Specific requirements for horizontal load-bearing separating components.

TCVN 9311-6:2012, Fire resistance experiment - Building components – Part 6: Specific requirements for beams and girders.

TCVN 9311-7:2012, Fire resistance experiment - Building components – Part 7: Specific requirements for pillars.

TCVN 9311-8:2012, Fire resistance experiment - Building components – Part 8: Specific requirements for vertical non-load-bearing separating components.

TCVN 9383:2012, Fire resistance experiment – Door and fire-rated doors.

1.4. Term interpretation

In this Regulation, terms below are construed as follows:

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fire safety for buildings and constructions (work items)

Refers to satisfaction of material characteristic and construction material structure requirements, architectural, planning solutions, technical and technological solutions satisfactory to use of the constructions in order to prevent fire (fire prevention), limit fire spread, guarantee fire suppression (firefighting), prevent harmful factors to human, and minimize property damage in case of fire.

1.4.2

fire engine parking space

Refers to road with finished surface that can withstand large load and is distributed along a building’s exterior area in parts or in whole in order to allow fire-fighting facilities to commence firefighting activities.

NOTE: In comparison with fire access, fire engine parking space is designed to withstand a larger load with greater width to enable deployment of fire-fighting facilities.

1.4.3

fire protection

Refers to a combination of organization methods and technical solutions to prevent impact of fire on human and limit physical damage caused by fire.

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Refers to ability to withstand fire of a building which is divided into categories I through V and determined by fire-resistance rating of primary construction components (2.6.2.).

1.4.5

smoke control device

Refers to a device which diverts, contains and/or prevents the spread of smoke (gaseous product of a fire).

NOTE: Smoke control devices can also be called: smoke curtains, smoke blinds, smoke screens.

1.4.6

fire hazard level of structural components

Refers to a characteristic of structural components which is determined based on different levels of experiment results of combusting of structural component materials according to regulations and standards.

NOTE: consult 2.3 and Annex B.

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structural fire hazard level of buildings

structural fire hazard level of a building is determined based on fire hazard level of primary structural components of the building.

1.4.8

building height for fire service (fire service height)

Refers to the height from lowest point of a fire access to the lowest point of a doorway (window) on the outer wall of the topmost storey, excluding the topmost floor. In case of buildings with no doorway (window) available on the topmost storey, fire service height shall equal the total products of both height from fire access to the ceiling of the topmost storey and height from fire access to the floor of the topmost storey divided by 2. In case the roof is employed, fire service height of a building shall equal the greatest height from fire access to the highest point of the wall surrounding the roof.

1.4.9

height of solid stream

Equals 0.8 times the height of a stream introduced vertically.

1.4.10

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Refers to floor area of all enclosed spaces in a building in parts or in whole, including area of service ducts, elevator shafts, toilets, staircases, areas occupied by fixed or movable furniture, equipment, or facilities and any open-to-sky habitable areas above or below the first storey of the building.

1.4.11

fire access

Refers to a road designed to enable fire-fighting facilities to access and maneuver within a building’s vicinity to commence firefighting and rescue activities.

1.4.12

fire-resistance rating

Refers to time period (in hours or minutes) of a sample starting from the beginning of fire resistance test in standard heat until any of the limit states of the sample appear.

1.4.13

area of refuge

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1.4.14

Technical room

Refers to a room where technical equipment of a building or storey is stored. Multiple technical rooms may occupy a mechanical floor in part or in whole.

1.4.15

single-loaded corridor

Refers to a corridor whose one side receives natural ventilation, runs interrupted and continuously along the corridor’s length with clearance height from the highest point of the outer wall to the ceiling no lower than 1.2 m.

1.4.16

fire protection system

Includes: Smoke control system, indoor fire hydrant systems, outdoor water supply for firefighting, automatic fire alarms, automatic fire extinguisher systems, public fire alarms and sirens, emergency and exit lighting systems, fire service elevators, aid and rescue equipment, structure solutions, rescue solutions, smoke prevention solutions and fire spread prevention.

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fire hydrant

Refers to a combination of specialized equipment including valves, hoses, and nozzles installed in advance to deliver water to the fire.

1.4.18

fire compartment

Refers to a section of a building that is separated from other sections by class 1 fire-rated walls.

1.4.19

buffer space

Refers to a space between 2 doorways which prevents infiltration of smoke and other gases into the building, stairwell or other rooms.

1.4.20

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Refers to a buffer space consisting of components having satisfactory fire-resistance rating (consult 2.4.3.).

1.4.21

smoke

Refers to a gaseous product of partially burned material that is in solid and/or liquid form.

1.4.22

protective concrete layer and thickness thereof

- Refers to the concrete layer that is determined from the edge of a structural component to the nearest surface of a rebar.

- Thickness of a protective concrete layer is the thickness determined from the edge of a structural component to the nearest surface of a rebar.

1.4.23

...

Refers to a visible burning body in gas form.

1.4.24

building

Refers to a structure which is constructed primarily to protect and shelter people or contents within, usually covered in part or in whole, and constructed in a fixed location. Buildings include civil buildings (houses, apartment buildings, public buildings, multi-purpose buildings) and industrial building.

1.4.25

apartment building

Refers to a building that has 2 storeys or more, many flats, shared passages and staircases, private property, shared property and infrastructure systems shared by all households, individuals and organizations, and can be classified into an apartment building for residential purposes or an apartment for both residential and commercial purposes (otherwise referred to as “multi-purpose apartment building”).

1.4.26

multi-purpose building

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NOTE: A multi-purpose building must conform to all regulations on fire safety applicable to multi-purpose building when shared floor area for any given function does not exceed 70% of total floor area (excluding floor area for technical systems, firefighting, area of refuge, and parking space).

1.4.27

fire hazard category by function

Refers to characteristics of a building (or sections thereof) based on use purposes and factors that potentially threaten human safety in case of fire, taking into account age, physiques and chances of persons sleeping, etc. of group of individuals using the primary purposes.

1.4.28

fire hazard category of construction materials

Refers to a characteristic of structural components which is determined based on different levels of experiment results regarding combusting structural component materials according to regulations and standards.

1.4.29

fire prevention

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1.4.30

compartment volume

Refers to volume of a space in a building or a fire compartment. This volume does not include walls of protected elevators, emergency staircases and other spaces (e.g. sanitation areas and storage units) covered by walls with fire resistance ratings less than 1 hour and corridors passing through walls protected by class 2 fire rated doors installed with automatic door closing mechanisms. Compartment volume shall be calculated based on following dimensions:

a) Clearance area is based on distance between inner finished areas of surrounding walls, or in case of surfaces without surrounding walls, calculated from a vertical surface to the topmost outer edge of the floor.

b) Height is based on distance from the highest point of the lower floor to the lowest point of the upper floor; and

c) In case of a building or fire compartment that extends to the ceiling, calculate up to the lowest point of the ceiling or lower surface of ceiling of the highest level in a fire compartment, including spaces occupied by unprotected walls, vertical shafts, service ducts, or structure within the calculated space.

1.4.31

smoke control lobby

Refers to a lobby situated outside of an emergency staircase. The design of this lobby must be able to prevent or minimize infiltration of smoke into the staircase.

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elevator hall

Refers to the empty space in front of entrance to the elevator.

1.4.33

number of storey

Total number of storey of a building includes all above-ground levels (including technical floors and storeys where rooftop access is located) and basements/semi-basements while garrets are not included.

NOTE: A storey where rooftop access is located shall not be counted towards total number of storey of a building when the rooftop access is primarily used for covering stairwell/elevator shaft and sheltering technical equipment of the building (if any), and has ceiling area not exceeding 30 % of rooftop area.

1.4.34

fire incident

Refers to an uncontrollable fire that leads to human and/or property damage.

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fire

Refers to an exothermic oxidizing reaction of a chemical that is accompanied by any of the 3 factors: flame, light, or smoke.

1.4.36

standard documents

Refer to documents that set forth principles, guidelines or characteristics regarding activities or results thereof.

NOTE 1: The term “standard documents” generally refer to documents such as technical standards and regulations, practice guidelines and technical regulations.

NOTE 2: The term “documents” must be interpreted as information carriers.

NOTE 3: Terms that are used to indicate different standard forms of document are determined on the basis of considering documents and contents thereof as a single unit.

1.4.37

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Refers to total heat released via burning of all flammable materials within a space of a construction.

1.4.38

garret

Refers to the storey situated in the space directly beneath the pitched roof or portions of vertical surfaces thereof that are created by roof pitches or gables with surrounding walls (if any) no taller than 1.5 m.

1.4.39

basement

Refers to a storey with more than half the height thereof situated below ground level on which the building is located according to approved planning.

NOTE: When considering fire safety requirements for buildings with varying surrounding ground elevation, a storey situated below ground level as per approved planning shall not be considered a basement if emergency egress thereof does not direct upwards.

1.4.40

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Refers to a storey for temporary evacuation that is located in a building with fire service height taller than 100m. A refuge floor may have one or many areas of refuge.

1.4.41

semi-basement

Refers to a storey whose height is half situated at or above ground level on which the building is located according to approved planning.

1.4.42

mechanical floor

Refers to a storey or part of a storey where technical rooms or technical equipment of the building are situated. The mechanical floor can be the basement, semi-basement, garret, the topmost storey or any storey in-between.

1.4.43

above-ground storey

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1.4.44

fire service elevator

Refers to an elevator which is installed primarily to transport passengers and equipped with additional protection control, communication systems and signs to allow the elevator to be operated under direct control of fire brigade in order to reach storeys of the building in case of fire.

1.4.45

smoke compartment

Refers to a compartment in a construction that is limited or surrounded by smoke control devices or structural components to prevent the spread of smoke produced by fire.

NOTE: Consult D.7, Annex D.

1.4.46

structural fire prevention

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1.5. General provisions

1.5.1. Design of buildings must include appropriate structural solutions, premise – spatial distributions and construction techniques that, in case of fire:

- The buildings can maintain overall integrity and deformation resistance in a specific period of time which is prescribed by fire resistance category of the buildings

- All building inhabitants (regardless of age and health conditions) can evacuate outside to safe area (hereinafter referred to as “outside”) prior to being met with life and health threatening risks which are produced by harmful factors of the fire.

- Ability to rescue humans is guaranteed.

- Firefighting brigade and facilities can access the fire, commence firefighting activities, and rescue humans and properties.

- Fire is prevented from spreading to adjacent buildings even when the burning buildings collapse.

- Direct and indirect damage to tangible assets including buildings and contents thereof is limited, taking into account economic relation between damage cost and costs for fire prevention, firefighting solutions and technical equipment.

1.5.2. During construction process:

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- Fulfill fire prevention and firefighting requirements for constructions in progress and auxiliary works, and regulations on fire prevention and firefighting in construction and installation as per applicable fire prevention and firefighting laws.

- Equip operational fire-fighting facilities as per the law.

- Guarantee the abilities of exiting safely, rescuing humans and protecting properties in case of fire breaking out while construction is in progress and in construction site.

1.5.3. During operation:

- Maintain structure and interior of the buildings as well as working capacity of firefighting facilities as per design requirements and relevant technical documents.

- Implement fire prevention and firefighting regulations as per applicable laws.

- Refrain from altering structure or premise – spatial arrangement solutions and construction technical solutions without design approved as per the law.

- Upon conducting repair, do not employ structural components and materials that fail to satisfy applicable regulations and standards.

When a building is licensed under limited fire loading condition, limited inhabitants in the building or any part of the building, notice on these limitations must be erected in visible locations in the building while managerial individuals of the building must establish separate fire prevention, firefighting and evacuation solutions in case of fire.

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2. FIRE-RELATED CLASSIFICATION

2.1. General provisions

2.1.1. Buildings and sections, parts thereof, rooms, construction materials, and construction components are classified in terms of fire based on:

- Fire risks: ability to start and develop elements bearing fire risks.

- Fire resistance: ability to resist effect of the fire and prevent the spread of dangerous elements of the fire.

2.1.2. Fire-related technical classification is to establish necessary requirements for fire protection for structure, rooms, buildings, sections and parts of buildings based on fire resistance and/or fire risk thereof.

2.2. Construction materials

2.2.1. With respect to fire safety, construction materials shall be characterized with only fire risks.

Fire risk of construction materials shall be determined based on: flammability, combustibility, ability to spread fire on the surface, and ability to produce smoke and toxic substances.

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- Ch1 (mildly flammable).

- Ch2 (moderately flammable).

- Ch3 (flammable).

- Ch4 (highly flammable).

Flammability and groups of construction materials classified according to flammability shall conform to B.2, Annex B.

With respect to non-flammable construction materials, fire risk and other properties are not required to be determined.

2.2.3. With respect to combustibility, flammable construction materials shall be classified into 3 categories:

- BC1 (hardly combustible).

- BC2 (moderately combustible).

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Groups of construction materials classified according to combustibility shall conform to B.3, Annex B.

2.2.4. With respect to surface fire spread, flammable construction materials shall be classified into 4 categories:

- LT1 (no spread).

- LT2 (weak spread).

- LT3 (moderate spread).

- LT4 (fast spread).

Groups of construction materials classified according to ability to spread fire on the surface are applied to surface materials of roofs, floors and flooring materials according to B.4, Annex B.

With respect to other construction materials, classifying in terms of ability to spread fire on surfaces is not required.

2.2.5. With respect to ability to produce smoke, flammable construction materials shall be classified into 3 categories:

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- SK2 (moderate smoke production).

- SK3 (high smoke production).

Groups of construction materials classified according to ability to produce smoke shall conform to B.5, Annex B.

2.2.6. With respect to toxicity of combustion products, flammable construction materials shall be classified into 4 categories:

- DT1 (low toxicity).

- DT2 (moderate toxicity).

- DT3 (high toxicity).

- DT4 (particularly high toxicity).

Groups of construction materials classified according to toxicity of combustion products shall conform to B.6, Annex B.

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2.3.1. Construction components shall be characterized by fire resistance and fire risk.

Fire resistance of a component is represented by the fire-resistance rating of that component. Fire risk of a component is represented by fire hazard level thereof.

2.3.2. Fire-resistance ratings of construction components are determined by a period of time (in minutes) from the point in which fire resistance tests with standard heat begin until one or many following signs of limit states prescribed for the components as per the law appear:

- Loss of load-bearing capacity (load-bearing capacity is assigned with the letter “R”).

- Loss of integrity (integrity is assigned with the letter “E”).

- Loss of thermal insulation (thermal insulation is assigned with the letter “I”).

NOTE 1: Fire-resistance ratings of construction materials shall be determined by fire resistance test according to standards from TCVN 9311-1:2012 to TCVN 9311-8:2012 or equivalent standards. Fire-resistance rating of construction materials can be identified by calculation according to applicable fire-resistance design standards.

Fire-resistance ratings of air ducts shall conform to ISO 6944 or equivalent standards.

Fire resistance rating of fire suppression valves of ventilation systems shall conform to ISO 10294 or equivalent standards.

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NOTE 2: Required fire-resistance ratings of specific construction components are mentioned in these Regulations and technical regulations applied to each type of construction. Fire-resistance ratings of construction components are represented with REI, EI, RE or R accompanied by number dictating duration of burning in minute. E.g. A component with fire-resistance rating of REI 120 means the component must be able to retain all 3 capacities: load-bearing, integrity and thermal insulation under impact of fire for 120 minutes; A component with fire-resistance rating of R 60 means the component must be able to retain load-bearing capacity for 60 minutes regardless of integrity and thermal insulation.

NOTE 3: Some construction components are considered as satisfactory to fire resistance (fire-resistance ratings) if any of following conditions is satisfied:

a) The components share technical properties with samples of fire resistance test and samples display fire-resistance ratings no lower than the required fire-resistance ratings of those component; or

b) Fire-resistance rating of components determined by calculation according to standard fire resistance design must be no lower than required fire-resistance ratings of said components; or

) The components share technical properties with components specified in Annex F and corresponding fire-resistance rating under Annex F is no lower than required fire-resistance ratings of said components.

2.3.3. With respect to fire risks, construction components shall be classified into 4 categories:

- K0 (no fire risk).

- K1 (mild fire risk).

- K2 (moderate fire risk).

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NOTE 1: Fire hazard level of components are developed based on testing in accordance with applicable Vietnamese standards or equivalent standards.

NOTE 2: May determine fire hazard levels of components without testing as follows:

a) Components shall be classified as K0 if they are made solely from non-flammable materials.

b) Components shall be classified as K1 if outer surfaces of the components are made from materials with fire-related technical requirements no higher than Ch1, BC1 and SK1.

c) Components shall be classified as K2 if outer surfaces of the components are made from materials with fire-related technical requirements no higher than Ch2, BC2 and SK2.

d) Components shall be classified as K3 if outer surfaces of the components are made from materials with any of the fire-related technical requirements is Ch3, BC3 and SK3.

2.4. Fire prevention devices

2.4.1. Fire prevention devices are for preventing fire and other combustion products from spreading from one fire compartment or a room with fire to another room.

Fire prevention devices include fire-rated walls, fire-rated partitions and fire-rated floor.

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Fire resistance of a fire prevention device shall be determined by fire resistance of its component, including:

- Separating sections (partitions, walls, floors, etc.);

- Stabilizing sections (frames, rebar, etc.);

- Supporting section (supporting beams, supporting sides, supporting walls, etc.);

- Connecting components in-between.

Fire-resistance ratings based on load-bearing (R) capacity of stabilizing sections, supporting sections and connecting components must not be lower than required fire-resistance ratings of the separating sections.

Fire risks of fire prevention devices shall be determined by fire risks of separating sections and stabilizing sections, connection components thereof.

2.4.3. Fire prevention devices shall be classified based on fire-resistance ratings of separating sections as shown in Schedule 1. If separating sections are installed with doors, gates, trapdoors, air valves, windows and blinds (hereinafter collectively referred to as “fire rated doors and valves”) or buffer spaces (fire-rated buffer spaces), fire-rated doors, fire-rated valves and fire-rated buffer spaces must have the ability to prevent fire spread corresponding to type of fire prevention devices under Schedule 1.

Fire-resistance ratings of fire-rated doors and valves in fire prevention devices are specified in Schedule 2.

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Type 1 fire prevention devices must have K0 fire hazard level. In special cases, may utilize K1 fire hazard level in type 2 to type 4 fire prevention devices.

Schedule 1 – Classification of fire prevention devices

Fire prevention devices

Type of fire prevention devices

Fire-resistance ratings, no lower than

Type of fire-rated doors and valves, no lower than

Type of fire-rated buffer spaces, no lower than

1. Fire-rated walls

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REI 45

2. Fire-rated partitions

EI 45

...

EI 15

REI 150

...

REI 60

REI 45

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Schedule 2 - Fire-resistance ratings of fire-rated doors and valves in fire prevention devices

Fire-rated doors and valves in fire prevention devices

Type of fire-rated doors and valves in fire prevention devices

Fire-resistance ratings, no lower than

1. Doors, gates, trapdoors, valves ¹⁾

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EI 30 ²⁾

EI 15

2. Windows

E 60

E 30

...

E 15

3. Partitions

EI 60

¹⁾ Fire-resistance ratings of fire prevention valves shall be solely based on integrity (E) if such valves are installed in service ducts, shafts and pipes in a manner that meets required fire resistance, applicable to both integrity (E) and thermal insulation (I).

²⁾ Fire-resistance ratings of elevator shafts must not be lower than E 30.

Schedule 3 – Fire-resistance ratings of components of buffer spaces of fire-rated doors and valves in fire prevention devices

Type of fire-rated buffer spaces

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Partitions of buffer spaces

Floors of buffer spaces

Fire-rated doors and valves of buffer spaces

EI 45

REI 45

EI 30

EI 15

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EI 15

2.5. Stairs and stairwells

2.5.1. Stairs and stairwells for evacuation exit shall be classified into following categories:

NOTE: Under Annex I are illustrations of stairs and stairwells.

a) Types of stairs:

- Type 1 – indoor stairs, positioned inside stairwells.

- Type 2 – indoor stairs, exposed.

- Type 3 – outdoor stairs, exposed.

NOTE: “Exposed” means not positioned inside a stairwell.

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- L1 – a stairwell with doors granting access to each level (with or without glasses installed).

- L2 – a stairwell receiving natural lighting via skylight (with or without glasses installed).

c) All types of smoke proof enclosure:

- N1 – a stairwell granting access to each storey through a smoke proof buffer space implemented by appropriate natural ventilation solutions. Cases of appropriate N1 stairwell designs are specified in 3.4.10.

May replace N1 stairwells with stairwells granting access to each storey through a buffer space. Both buffer spaces and stairwells must receive positive pressure ventilation in case of fire. Air supply for buffer spaces and stairwells must be separate from each other.

- N2 – a stairwell receiving positive pressure ventilation (air pressure inside the stairwell must be higher than air pressure outside the stairwell) in case of fire.

- N3 – a stairwell granting access to each storey through a buffer space receiving positive pressure ventilation (the positive pressure ventilation received by the buffer space shall be on a regular basis or in case of fire).

2.5.2. Transport methods serving firefighting and rescue are classified into 2 categories as follows:

- P1 – vertical elevators.

...

2.6. Buildings, fire compartments and rooms

2.6.1. Buildings or parts thereof separated by class 1 fire-rated walls (called fire compartments) shall be classified based on fire-resistance categories, structural fire hazard levels and fire hazard categories. May separate fire compartments in buildings with fire resistance categories of level IV and level V by class 2 fire-rated walls.

- Fire resistance categories of buildings and fire compartments shall be determined by fire-resistance ratings of construction materials thereof.

- Structural fire hazard levels of buildings and fire compartments shall be determined by participation of structural components in developing the fire and forming dangerous elements of the fire.

- Fire hazard categories of buildings and sections thereof shall be determined based on use purposes and characteristics of technological procedures situated within.

2.6.2. Buildings and fire compartments shall be classified based on fire resistance categories as shown in Schedule 4.

Schedule 4 – Fire resistance categories of buildings

Fire resistance category

Fire-resistance ratings of building structures, no lower than

...

Outer non-load bearing walls

Floors in-between levels (including floors of garrets and basements)

Roof sections without garrets

Staircase structures

Roofing (including thermal insulated roofing)

Frames, beams, pillars

Inner walls

Stairs and landings

...

E 30

REI 60

RE 30

R 30

REI 120

R 60

R 90

E 15

...

RE 15

R 15

REI 90

R 60

III

R 45

E 15

REI 45

RE 15

...

REI 60

R 45

R 15

E 15

REI 15

RE 15

R 15

REI 45

...

No requirements

NOTE 1: In buildings with fire resistance categories I, II and III, floors and ceilings of basements and semi-basements must be made of non-flammable materials and have fire-resistance ratings of at least REI 90. Floors of 1st storey and the topmost storey must be made from materials with flammability no lower than Ch1.

NOTE 2: In buildings with fire resistance categories IV and V, floors of basements or semi-basements must be made from materials with flammability no lower than Ch1 and fire-resistance rating no lower than REI 45.

NOTE 3: In buildings with 2 or 3 basements (buildings under category F1.3 and multi-purpose buildings), load-bearing structures and components in basements must have a minimum fire-resistance rating of R 120.

NOTE 4: In rooms for manufacturing or preserving flammable liquid, the floors must be made of non-flammable materials.

Load-bearing components of buildings include walls and load-bearing pillars, beams, connectors, hard partitions and sections of floors participating in ensuring overall integrity and ability to resist deformation of the buildings in case of fire.

Load-bearing components that do not participate in ensuring overall integrity of the buildings must be specified by design departments in technical documents of the buildings.

Fire-resistance ratings for devices sealing openings (doors, gates, windows, trapdoors, skylights and including openings on top and sections allowing light to pass through the roofing) is not prescribed, except fire rated doors and valves in fire prevention devices and special cases to be specified.

...

In N1 smoke proof enclosures, may use treads and landings with R 15 fire-resistance rating and K0 fire hazard level.

2.6.3. According to structural fire hazards, buildings and fire compartments shall be classified into 4 levels of S0, S1, S2 and S3 as shown in Schedule 5 – structural fire hazard levels.

Fire hazards for doors, gates, windows and trapdoors in sheltering structures of buildings are not prescribed, except for special cases.

Schedule 5 – Structural fire hazard levels of buildings

Structural fire hazard levels of buildings

Fire hazard levels of construction components, no lower than

Load-bearing structures in form of bars (pillars, beams, etc.)

Outside of outer walls

Walls, partitions, floors and roofs without garrets

...

Stairs and landings in stairwells

(1)

(2)

(3)

(4)

(5)

(6)

...

No requirements

...

2.6.5. Buildings and sections thereof (rooms with functions related to one another) shall be classified into fire hazard category by function depending on their use characteristics and threat to human safety in case of fire taking into account: age, physical attributes, possibility of people sleeping, groups of people utilizing primary functions and number of said groups. Fire hazard categories are specified under Schedule 6.

Buildings and rooms for manufacturing or storing shall be classified (A, B, C, D, E) based on fire risks and explosion risks according to quantity and explosion risks of substances and materials within, taking into account properties of manufacturing technology. Classification shall be specified under Annex C.

Rooms for manufacturing and storing, including laboratories and warehouses with more than 50 m² in area, rooms for preparing food with more than 10 KW with cooking equipment in buildings under categories F1, F2, F3 and F4 shall be placed under category F5.

2.6.6. With respect to buildings with defined fire hazard categories, in general cases, may allocate rooms having other fire hazard categories by functions while complying with regulations under design standards for specific buildings and technical equipment in addition to these Regulations.

Schedule 6 – Classification of buildings depending on fire hazard categories by functions

Category

Use purpose

Use features

(1)

...

(3)

Buildings for temporary or permanent residential purposes (including 24/7 residence).

Rooms in said buildings are regularly used 24/7. People inhabiting the buildings may vary in ages and physical attributes. One of the features of said buildings are presence of bedrooms.

F1.1

Kindergartens, preschools, childcare facilities; hospitals (excluding field hospitals), in-patient facilities of epidemic management facilities, general clinics, specialized clinics, maternity wards; facilities for the elderly and persons with disabilities (other than flats), pension homes; bedroom blocks of boarding schools, facilities for children and buildings with similar use features.

F1.2

Hotels, motels, rental apartments; dorms, bedroom blocks of nursery facilities, nursing homes, intensive care units, orthopedic facilities and other accommodations with similar use features

F1.3

...

F1.4

Detached residential buildings and buildings with similar use features.

Cultural and sports facilities

Primary rooms in such buildings are characterized by large amount of customers inhabiting in certain period of time.

F2.1

Theaters, movie cinemas, circuses, musical concerts; clubs; sports structures with bleachers, competition stadiums, indoor pools, indoor sports facilities and other structures with calculated seats for audience in closed spaces; libraries, convention centers, event centers excluding food and drink services; and buildings with similar use purposes.

F2.2

Museums, exhibits, dancing rooms, singing rooms, bar clubs, karaoke venues, similar facilities in closed spaces; building blocks of amusement parks, aquariums, and buildings with similar use features

...

Facilities mentioned in F2.1, exposed; amusement parks; and buildings with similar use purposes.

F2.4

Facilities mentioned in F2.1, exposed.

Commercial, business and civil service facilities.

Rooms in these facilities are characterized by number of customers greatly exceeding number of servers.

F3.1

Product sale facilities, rooms for exhibiting products, fair centers, shopping malls, electronic sale centers, supermarkets, convenient stores, bookstores; automobile, moped stores; and buildings with similar use features.

F3.2

...

F3.3

Railway stations, airports; cable car stations for passengers, ferry stations, coach stations; buildings with similar use purposes.

F3.4

General and specialized (out-patient) clinics and emergency medical care facilities; outpatient treatment facilities of other medical facilities such as medical stations, orthopedic facilities, plastic surgery facilities, intensive care units; massage facilities; buildings with similar use purposes.

F3.5

Rooms for customers of enterprises, life service providers and public spaces with uncalculated seats for customers (post offices, post agencies, saving funds, ticket booths, law consulting offices, notary offices, laundry facilities, tailors, shoe and clothing repair facilities, barbers); funeral service providers, religion establishments; and similar structures.

F3.6

Sports compounds, sports training and competition facilities without bleachers; service rooms, stadiums, tracks, shooting ranges; buildings with similar use purposes.

...

Rooms in such buildings are used for specific period of time in a day, regularly occupied by identified groups of people who are used to current conditions with specific age and physical attributes.

F4.1

Primary schools, lower secondary schools, multi-level formal education institutions (excluding preschools, kindergartens), upper secondary schools, professional secondary schools, vocational education institutions, training facilities for religion activists in teenage years; buildings with similar use purposes.

F4.2

Higher education facilities, junior colleges, professional enhancement schools; technician education institutions; training facilities for religion activists not mentioned under F4.1; buildings with similar use purposes.

F4.3

Head offices of management agencies, regulatory agencies of all levels, working offices of office workers in enterprises, socio - political organizations; religious facilities; designing facilities, scientific research facilities, seismic research centers, meteorology and hydrology centers, space research facilitates; information organizations publishing houses; radio, television, telecommunication facilities, communication device installers; financial institutions, agencies, offices; buildings with similar use purposes.

F4.4

Firefighting and rescue, evacuation stations (departments).

...

Buildings, structures and rooms for manufacturing or storing.

Such rooms are characterized by presence of groups people working regularly, including 24/7

F5.1

Buildings and structures for manufacturing, rooms for manufacturing, experimenting, servicing, storing, repairing and maintaining automobiles and mopeds; and buildings with similar use purposes.

F5.2

Buildings and structures for storage; automobile, motorbike and bicycle parking lots without servicing and repairing services; book storage, storage centers, specialized data centers, storage spaces; commodity storage of inland ports; storage of flammable commodities and materials or non-flammable commodities and materials contained in flammable packaging; buildings with similar use purposes.

F5.3

Buildings serving agriculture and rural development.

3. HUMAN SAFETY ASSURANCE

...

3.1.1. Requirements of this section are to guarantee:

- Timely and unobstructed evacuation for humans;

- Rescue of people under impact of dangerous elements of the fire;

- Human protection along egress route, away from impact of dangerous elements of the fire.

3.1.2. Evacuation refers to organized movement of humans from rooms where dangerous elements of the fire may affect them to outside. Evacuation also refers to involuntary movement of people having limited movement capabilities with assistance of serving staff. Evacuation is done via evacuation egresses.

3.1.3. Rescue refers to forced movement of people towards the outside when they are under influence of dangerous elements of the fire or in case of direct presence of said influences. Rescue shall be performed voluntarily with assistance of fire brigade or professionally trained employees, and include the use of rescue equipment via evacuation egresses and emergency egresses.

3.1.4. Human protection affairs on evacuation egress must be guaranteed by clearance – spatial organization solutions, conveniences, structures and technical properties of buildings and organizations

Evacuation egresses within vicinity of rooms must guarantee safe movement towards evacuation egresses from said rooms without taking into account smoke protection and fire suppression in the rooms.

Protection of evacuation egresses outside of rooms’ vicinity must be able to guarantee safety for human evacuation taking into account fire hazard categories by functions of rooms along the evacuation egresses, number of people evacuating; fire-resistance categories and structural fire hazard levels of buildings, number of evacuation egresses on one storey and from the entire buildings.

...

3.1.5. When designing evacuation from rooms and buildings, do not take into account rescue measures and devices as well as exits that fail to satisfy exit requirements under 3.2.1.

3.1.6. Do not situate rooms under category F5 class A or class B below rooms simultaneously occupied by 50 people; do not situate F5 rooms in basements and semi-basements.

Do not situate F1.1, F1.2 and F1.3 rooms in basements and semi-basements.

3.1.7. In buildings with 2 to 3 basement storeys, may situate smoking rooms, supermarkets, commercial centers, diners, drinks store and other public spaces below the first basement storey only if additional fire safety measures are developed and approved by competent Police Departments of Fire Prevention and Fighting and Rescue.

At least 1 entry leading to exit stairwells via smoke control lobbies separated from surrounding spaces by class 2 fire-rated walls must be installed on each basement storey. Doors must be installed with auto-closing mechanism.

3.1.8. In order to ensure safe exit, must detect and report fire promptly. Buildings and sections thereof must be equipped with fire alarm systems according to applicable regulations and law.

NOTE: Basic requirements regarding fire alarm systems are specified in TCVN 3890.

3.1.9. In order to protect building inhabitants during evacuation, prevent smoke from infiltrating evacuation egresses of buildings and sections thereof.

NOTE: Basic requirements regarding smoke protection of buildings are specified under Annex D.

...

3.2. Evacuation egresses and emergency egresses

3.2.1. An egress is considered an evacuation egress if it:

a) leads from rooms on the 1^st storey outside:

- Directly; or

- Via corridors; or

- Via lobbies (or waiting rooms); or

- Via stairwells; or

- Via corridors and lobbies (or waiting rooms);

- Via corridors and stairwells.

...

- Directly to stairwells or to type 3 staircases; or

- To corridors that lead directly to stairwells or to type 3 staircases; or

- To commonly shared rooms (or waiting rooms) which lead directly to stairwells or type 3 staircases; or

- To side corridors of buildings with fire service height below 28 m that lead directly to type 2 staircases.

c) leads to adjacent rooms (except for rooms under category F5 class A or B) on the same storey with egresses specified under Points a) and b) of this Article. Egresses leading to class A or B rooms shall be considered evacuation egresses if they lead from technical rooms without frequent operators and are used to serve class A or B rooms above.

3.2.2. Egresses from basements and semi-basements are considered evacuation egresses if they lead directly outside and separately from common stairwells of the buildings (illustration in Figure I.1, Annex I).

May allocate:

- Evacuation egresses from basement through common stairwells with separate routes leading outside isolated from remaining parts of stairwells by class 1 solid fire-rated partitions (illustration in Figure I.2, Annex I);

- Emergency egresses from basements and semi-basements which contain class C, D, E rooms which lead to class C4, D, and E rooms and to lobbies on the 1st storey of category F5 buildings if requirements under 4.25 are satisfied;

...

- Buffer spaces (including double buffer spaces) along direct egresses from buildings, basements and semi-basements.

3.2.3. An egress is not considered evacuation egress if any form of sliding, folding, rolling, or revolving door is installed.

An egress with hinged doors installed along shall be considered an evacuation egress if the doors are designed as per the law.

3.2.4. Quantity and width of evacuation exits from rooms, storeys and buildings are defined based on the largest amount of people possible travelling through and permissible maximum distance from places potentially occupied by humans to the nearest evacuation exits.

NOTE 1: The largest amount of people to evacuate from different spaces of buildings or sections is determined according to G.3, Annex G.

NOTE 2: Apart from general requirements specified under these Regulations, specific requirements regarding quantity and width of evacuation exits are specified in technical regulations on each type of construction. Annex G prescribes specific requirements for commonly seen types of buildings.

When rooms simultaneously occupied by more than 50 people and having fire risk categories by functions different from those of buildings, ensure separate evacuation routes for said rooms (leading directly outside or into stairwells).

3.2.5. Following rooms must have at least 2 evacuation egresses:

- F1.1 rooms simultaneously occupied by more than 15 people.

...

- Rooms simultaneously occupied by more than 50 people.

- Rooms under category F5 class A or B with more than 5 people working in a shift, class C with more than 25 people working in a shift or rooms larger than 1 000 m².

- Exposed working floors or floors for people operating and maintaining equipment in category F5 rooms larger than 100 m² – with respect to rooms under class A or B or larger than 400 m² – for rooms under other classes;

- With respect to category F1.3 rooms (flats) situated on both storeys (commonly referred to as bi-level flats), if fire service height of upper storey is more than 18 m, install evacuation exits on each storey.

3.2.6. Storeys of following building categories must have no less than 2 evacuation egresses:

- F1.1; F1.2; F2.1; F2.2; F3; F4;

- F1.3 when total area of flats on a storey exceeds 500 m² (for detached houses, calculate area of that storey). In case total area is not larger than 500 m² and only 1 evacuation egress from each storey, each flat situated a height taller than 15 m must have an emergency egress according to 3.2.13 in addition to emergency egresses;

- F5, class A or B if at most more than 5 people simultaneously working in a shift, class C if at most more than 25 people simultaneously working in a shift.

Basements and semi-basements must have no less than 2 evacuation exits if they are larger than 300 m² or simultaneously occupied by 15 people.

...

- With respect to buildings with fire service height no taller than 15 m, area of each storey must not exceed 300 m².

- With respect to buildings with fire service height ranging from 15 m to 21 m, area of each storey must not exceed 200 m² and the entire buildings must be protected by automatic fire suppression systems.

3.2.7. Number of evacuation egresses from any storey must not be less than 2 if such storey is where room(s) that requires 2 or more evacuation egresses situates.

Number of evacuation egress from a building must not be less than then number of evacuation egresses on any given storey of said building.

3.2.8. In case of at least 2 evacuation egresses, situate said egresses separately and take into account chances of the fire preventing people from using any of the egresses when calculating evacuation possibilities. Remaining egresses must be able to ensure safe evacuation for all people in the rooms, on the storeys or in the buildings (illustration in Figure I.3).

If a room, section or storey of a building requires at least 2 evacuation egresses, at least 2 of said egresses must be separated from another and the distance between any 2 egresses must equal or larger than half of the longest diagonal line across the room, section or storey of the building. Distance between 2 evacuation egresses shall be measured by the straight lines connecting their 2 nearest sides (illustration in Figure I.4 a), b) and c)).

If buildings are totally protected by sprinkler fire suppression systems, the distance may be reduced to 1/3 of the longest diagonal line of spaces mentioned above (illustration in Figure I.4 d)).

If 2 evacuation stairwells are connected by a corridor, the distance between 2 evacuation egresses (2 doors leading to the evacuation stairwells) shall be measured along the corridor (Figure I.5). The corridor must be protected according to 3.3.5.

3.2.9. Clearance height of emergency egresses must not be less than 1.9 m, clearance width must not be less than:

...

- 0.8 m – in all remaining cases.

Width of doors leading outside from stairwells and from stairwells to lobbies must not be less than calculated value or width of stair treads under 3.4.1.

In all cases, when determining width of an evacuation egress, must take into account geometric shapes of the emergency egress via doorways or doors in order to not obstruct transportation of medical stretches carrying injured persons.

3.2.10. Doors of evacuation egresses and other doors along evacuation route must be opened outwards.

No regulations on open direction for doors of:

- Rooms under categories F1.3 and F1.4.

- Rooms simultaneously occupied by no more than 15 people, other than class A or B rooms;

- Storage no larger than 200 m² and not regularly occupied by workers.

- Bathrooms.

...

3.2.11. Doors of evacuation egresses from corridors on storeys, commonly shared spaces, waiting rooms, lobbies and stairwells must not have locks so as to be opened from inside without keys. With respect to buildings with fire service height taller than 15 m, doors mentioned above must be solid doors or doors with tempered glass.

Doors of evacuation egresses from rooms or lobbies that are forced smoke proofed must be solid doors equipped with auto closing mechanism and jambs must be tightly wedged. If said doors need to be opened during use, they must be equipped with mechanism that automatically closes the doors in case of fire.

With respect to stairwells, doors must be equipped with auto closing mechanism and jambs must be tightly wedged. Doors stairwells that are opened directly outside may not be equipped with auto closing mechanism and jambs may not be tightly wedged. Except for cases otherwise specified, doors of stairwells must be class 1 fire-rated doors in category I or II fire-resistance buildings; class 2 in category III or IV buildings; and class 3 in category V buildings.

Apart from specific regulations, doors of evacuation egresses from lobbies leading to stairwells in a building with at least 4 storeys (except for buildings for incarceration or rehabilitation) must ensure:

- All electric locks installed on doors must be automatically unlocked as soon as fire alarm systems are activated. Said electric locks must also be automatically unlocked in case of power loss;

- People using stairwells can go back into the buildings via the doors that they leave or other doors allowing returning to the buildings;

- Allocate points of re-entry following the principles that doors shall only prevent re-entry if all requirements below are satisfied:

+ No less than 2 storeys which allows access to another evacuation egress via a stairwell.

+ No more than 4 in-between storeys that grant access to another evacuation egress via a stairwell.

...

+ Doors allowing re-entry must be marked on the inside with “CỬA CÓ THỂ DI VÀO TRONG NHÀ” (Doors allowing entry) with each letter is at least 50 mm tall and placed at a height of no lower than 1.2 m and no higher than 1.8 m.

+ Doors that do not allow re-entry must have notice posted on the inside in order to identify locations of doors allowing re-entry or the nearest exits for each direction of movement.

NOTE: With respect to doors that do not allow re-entry, place warning signs on the corridors inside the buildings (outside of the stairwells) dictating that people cannot re-enter the buildings once they go through the door.

3.2.12. Egresses that do not satisfy requirements for evacuation egresses may be considered as emergency egresses to raise safety level for people in case of fire. Emergency egresses must not be accounted for while calculating fire evacuation.

3.2.13. Apart from cases specified in 3.2.12, emergency egresses also include:

a) Egresses leading to balconies or loggias with solid walls no narrower than 1.2 m from edges of balconies (or loggias) to windows (or doors with glass) or no narrower than 1.6 m between glass windows opening towards the balconies (or loggias).

b) Egresses leading to exposed continuous passages (overpasses) and to adjacent blocks of buildings under category F1.3 or to adjacent fire compartments. These passages must not be narrower than 0.6m.

c) Egresses leading to balconies or loggias where external ladders connecting balconies and loggias on each storey.

d) Direct egresses from rooms having finished floor elevation no lower than negative 4.5 m and no higher than 5.0 m through windows having dimensions no less than 0.75 m x 1.5 m or via trapdoors no smaller than 0.6 m x 0.8 m; such egresses must be equipped with ladders; no regulations on steepness of the ladders.

...

3.2.14. May position evacuation exits with a height no less than 1.8 m in mechanical floors.

In mechanical floors for placement of technical networks (ducts, lines, etc.), may situate emergency egresses through doorways no smaller than 0.75 m x 1.5 m or via trapdoors no smaller than 0.6 m x 0.8 m without situating evacuation egresses.

In case of mechanical floors reaching up to 300 m², allow 1 evacuation egress and situate at least 1 additional evacuation egress for every following area equivalent or smaller than 2 000 m².

In underground mechanical floors, these egresses must be separated from other egresses of the buildings and leading directly outside.

3.3. Evacuation egress

3.3.1. Evacuation routes are continuous and unobstructed passages starting from any point in buildings or construction to outside. Evacuation routes must receive lightings and directions conforming to TCVN 3890.

3.3.2. Maximum permissible distance from the furthest position of the rooms or from the furthest workplaces to the nearest exit routes measured along the exit routes must be limited depending on:

- Fire hazard categories by functions and fire risk classes (consult Annex C) of rooms and buildings;

- Number of people evacuating;

...

- Structural fire hazard categories and fire resistance categories of buildings.

Length of evacuation routes along type 2 staircases shall equal 3 times the height of said stairs.

NOTE: Specific requirements regarding maximum permissible distance from the furthest point to the nearest evacuation egresses are specified on a case-by-case basis. Annex G prescribes specific requirements for commonly seen types of buildings.

3.3.3. When allocating and designing evacuation routes, must rely on requirements under 3.2.1. Evacuation routes must not include elevators, escalators and passages below:

- Passages leading through inner corridors with exits from elevator shafts, through elevator lobbies and buffer spaces in front of elevators if structures covering elevator shafts, including elevator doors fail to meet requirements applied to fire prevention devices.

- Passages going through stairwells when paths cutting across landings of stairwells are parts of inner corridors or cutting across rooms where type 2 staircases are situated and said stairs are not for evacuation;

- Passages going along roofs, except for roofs under utilization or parts of roofs furnished solely for evacuation.

- Passages going along type 2 staircases, connecting at least 3 storeys, or starting from basements/semi-basements, except for cases specified in 3.2.2.

3.3.4. Along evacuation routes in buildings of all fire resistance categories and structural fire hazard categories, except for buildings under fire resistance category V and buildings under class S3, do not use materials more flammable than groups below:

...

- Ch2, BC2, SK3, DT3 or Ch2, BC3, SK2, DT2 – for finished layers of walls, ceilings and ceiling materials in commonly shared lobbies, commonly shared rooms and waiting rooms.

- Ch2, LT2, SK2, DT2 – for floor coatings in lobbies, stairwells and elevator lobbies.

- BC2, LT2, SK3, DT2 – for floor coatings in commonly shared lobbies, commonly shared spaces and waiting rooms.

In rooms of category F5 class A, B and C1 where flammable liquid are manufactured, stored or used, floors must be made from non-flammable materials or materials with Ch1 flammability.

Hanging ceiling frames in rooms and on evacuation routes must be made from non-flammable materials.

3.3.5. In corridors along evacuation egresses mentioned in 3.2.1, except for cases otherwise specified in these Regulations, do not place: equipment/devices protruding from flat wall surfaces at a height no less than 2 m; ducts carrying flammable gas and liquid, wall cabinets, except for communication panels and cabinets containing fire hydrants.

Corridors mentioned in 3.2.1 must be coated with fire prevention devices conforming to regulations applied to each type of work item. Fire prevention devices covering middle corridors of category I fire resistant buildings must be made from materials with fire-resistance ratings no lower than EI 30 and of category II, III and IV fire resistant buildings must be made from non-flammable materials or materials with Ch1 flammability with fire-resistance ratings no lower than EI 15. With respect to buildings with fire resistance category II of fire hazard class D or E (consult Annex C), may cover corridors by glass walls. Doors leading to the corridors must be fire-rated doors with fire-resistance ratings no lower than fire-resistance ratings of fire prevention devices.

Corridors that are longer than 60 m must be divided by class 2 fire-rated partitions into sections with length defined in Annex D according to smoke protection requirements but no more than 60 m. Doors in the fire-rated partitions must conform to 3.2.11.

When doors of rooms are opened outward to corridors, width of evacuation routes along the corridors shall equal clearance width of the corridors subtracting:

...

- The entire protruding width of the doors (calculate whichever doors protruding the most) – when doors are placed on both sides of the corridors.

- These requirements do not apply to lobbies of storeys (commonly shared lobbies) situated between doors of flats and doors leading to stairwells in blocks of category F1.3 buildings.

3.3.6. Clearance height of horizontal sections of evacuation routes must not be less than 2 m, clearance width of horizontal sections of evacuation routes and slope sections must not be less than:

a) 1.2 m – for commonly used lobbies for evacuation for more than 15 people from category F1 rooms, more than 50 people – from rooms under other fire hazard categories.

b) 0.7 m – for passages leading to individual working spaces.

c) 1.0 m – for all remaining cases.

In any case, evacuation routes must be wide enough, taking into account of geometry shapes thereof in order to not obstruct transportation of medical stretches carrying injured persons.

3.3.7. On floors of evacuation routes must not have raised flooring with difference in height less than 45 cm or raised edges, except for doorsteps. At raised flooring sections, install steps with no less than 3 steps or slopes with steepness no more than 1 : 6 (height difference must not exceed 10 cm over length of 60 cm or angle created by slopes with flat surfaces must not be more than 9.5^o).

When constructing steps for places with more than 45 cm of differences in height, install guardrails.

...

3.4. Staircases and stairwells on evacuation routes

3.4.1. Width of stairs for evacuation, including stairs situated in stairwells, must not be smaller than calculated value or width of any evacuation egress (door) within the stairwells and must not smaller than:

a) 1.35 m – for buildings under category F1.1.

b) 1.2 m – for buildings with any storey, other than the 1^st storey, simultaneously occupied by more than 200 people.

c) 0.7 m – for staircases leading to individual working spaces.

d) 0.9 m – for all remaining cases.

3.4.2. Slope (angle) of stairs along evacuation routes must not be more than 1 : 1 (45^o); depth of tread must not be less than 25 cm and riser of tread must not be more than 22 cm.

Slope (angle) of exposed staircases leading to individual workplaces may be increased up to 2 : 1 (63.5^o).

May reduce tread depth of starting curved stairs (usually situated in lobbies of the 1^st storey) in the inner curve down to 22 cm; May reduce tread depth down to 12 cm for stairs used for rooms simultaneously occupied by no more than 15 people (other than category F5 class A or B rooms).

...

Type 2 staircases must satisfy requirements applied to treads and landings in stairwells.

3.4.3. Width of staircase landings must not be less than the width of stair tread. Width of landings in front of entrance to elevators (landings acting as elevator lobbies) of elevators having hinged doors opening outwards must not be less than total width of tread, half the width of elevator door and not be less than 1.6 m.

Length of intermediate landings in straight staircases must be no less than 1.0 m.

Doors that are opened to staircases must not reduce calculated width of landings and treads when they are opened.

3.4.4. Buildings under fire hazard category by function of F4 may be installed with curved staircases on evacuation routes when all following conditions are met:

- Stair height must not exceed 9.0 m;

- Width of flights of stairs shall conform to requirements under these Regulations;

- The smallest curve radius must not be less than twice the width of stair flights;

- Riser height must range from 150 mm to 190 mm;

...

- Width at the middle of the treads must not be less than 250 mm;

- Width of outer treads (270 mm away from the big ends of the treads) must not be more than 450 mm;

- The sum of 2 times the riser and width of inner treads must not be less than 480 mm and in case of width of outer treads, no greater than 800 mm.

3.4.5. In stairwells and buffer spaces (if any), do not place:

- Ducts carrying flammable gas and liquid.

- Wall cabinets, other than communication panels and cabinets containing fire hydrants;

- Exposed cables and power lines (except for power lines for low voltage electric devices) including for lighting corridors and stairwells.

- Exits from cargo elevators and cargo lifting devices;

- Exits of storage or mechanical rooms.

...

In spaces of stairwells, do no situate any function rooms.

3.4.6. In spaces of stairwells, other than smoke proof enclosures, may situate no more than 2 passenger elevators capable of descending to the 1st storey with structures sheltering elevator shafts made from non-flammable materials.

With respect to elevator shafts situated outdoors, use structural components made from non-flammable materials as sheltering structures.

3.4.7. Stairwells in the 1^st storey must have exits leading directly outside to the plot adjacent to the buildings or through lobbies separated from connecting corridors by class 1 fire-rated partitions with doorways. When situating evacuation exits from 2 stairwells through common lobbies, one of the evacuation exits must lead directly outside apart from leading to the lobbies.

May allocate evacuation exits from 2 stairwells through common lobbies with respect to buildings under 28 m, area of each storey does not exceed 300 m², number of occupants on each storey does not exceed 50 according to Schedule G.9 (Annex G) and the whole buildings must be protected by automatic fire suppression systems satisfactory to applicable regulations.

N1 type staircases must have exits that lead directly outside.

3.4.8. Stairwells must receive proper lighting. Except for L2 stairwells, lighting can be provided by skylights with less than 1.2 m² in area on outer walls of each storey.

May situate no more than 50% of stairwells without skylights for evacuation purposes in following cases:

- Category F2, F3 and F4 buildings: for N2 or N3 stairwells with positive pressure ventilation in case of fire.

...

L2 stairwells must have skylights on the roofs with less than 4 m² in area and gaps between stair flights not less than 0.7 m or skylights along the height of stairwells with cross-section area no less than 2 m².

3.4.9. Implementation of smoke proof of N2 and N3 stairwells shall conform to Annex D. If necessary, N2 stairwells shall be divided into compartments at different height with class 1 fire-rated solid partitions with respect to passages between compartments situated outside of the stairwells.

Windows in N2 stairwells must not be opened.

Buffer spaces of N3 stairwells must not be less than 3.0 m² and no less than 6.0 m² if said buffer spaces also act as lobbies of fire service elevators.

3.4.10. Smoke proof of smoke proofed buffer spaces leading to N1 smoke proof enclosures must receive natural ventilation with appropriate structural and surface planning solutions. Cases considered to be appropriate are:

NOTE: Annex I (I.3.2) illustrates methods of situating smoke proofed buffer spaces to allow access to N1 stairwells.

a) Smoke proofed buffer spaces must be open and connected to the outside and not usually situated in inner corners of buildings while must satisfy following requirements (Figure I.7):

- When parts of outer walls of the buildings are connected with other walls with an angle of less than 135^o, the horizontal distance from the nearest doorways in one buffer space to the vertex of adjoining angle must not be less than 4m; this distance may reduce to equal the protruding value of outer walls. These requirement does not apply to passages situated in adjoining corners exceeding 135^o and to protruding sections of outer walls that are less than 1.2 m.

- Width of walls between doorways of smoke proofed buffer spaces and the nearest doorways of the rooms must not be less than 2 m.

...

NOTE: Cases similar to this model are illustrated in Annex I, Figures I.8 a), b) and c).

b) Smoke proofed buffer spaces alongside corridors (Figure I.8 h), i) and k)) shall receive natural lighting and ventilation by openings leading to and connecting to following spaces:

- Outside space.

- Streets, public streets or other public spaces with open space above.

- Vertical skylights no narrower than 6 m and clearance area no less than 93 m².

c) Smoke proofed buffer spaces crossing smoke proof corridors that are no smaller than 6 m² with the smallest area of each dimension no less than 2 m are separated from adjacent areas of the buildings with class 2 fire-rated walls. Doors must be equipped with auto closing mechanism and jambs must be tightly wedged. Design of smoke proofed buffer spaces must not obstruct movement of people who are evacuating. Smoke proof capacity of smoke proofed buffer spaces must be guaranteed by:

- Air vents no smaller than 15 % of floor area of smoke proofed buffer spaces and situated no more than 9 m from any sections of the lobbies. These air vents must be connected to vertical skylights or concave ventilation compartments along the vertical sections of the buildings. Dimension of vertical skylights concave compartments must not be narrower than 6 m and clearance area must not be less than 93 m². Walls surrounding the vertical skylights must be able to resist fire for at least 1 hour and no other ventilation openings are situated in the skylights other than ventilation openings of smoke proofed buffer spaces, evacuation stairwells and sanitation areas (Figure I.8 d), e) and f)); or

- Corridors receiving horizontal ventilation with fixed ventilation openings situated on 2 outer walls. Ventilation openings on each outer walls must not have less 50 % of clearance area of the opposite outer walls. Distance from all points of corridor floors to any ventilation opening must not exceed 13 m (Figure I.8g)).

3.4.11. L1 stairwells and type 3 staircases may be situated in buildings of all fire hazard categories by functions with fire service height of up to 28 m; in that case, in category F5 and class A or B buildings, exits leading to corridors in class A or B rooms must travel across buffer spaces receiving positive air pressure ventilation.

...

When situating L2 stairwells, must satisfy following requirements:

- In F2, F3 and F4 buildings, number of L2 stairwells must not exceed 50 % of total number of stairwells, remaining stairwells must have skylights installed on outer wall at each level (L1 type).

- For F1.3 buildings constructed in blocks, each flat situated at a height above 4 m must have an emergency egress according 3.2.13.

3.4.13. In buildings with fire service height taller than 28 m, and F5 class A or B buildings, situate smoke proof enclosures and N1 stairwells.

NOTE: N1 stairwells may be replaced as specified in 2.5.1c) as long as the systems providing outside air to buffer spaces and stairwells must be powered by 3 prioritized sources (1 power grid systems and 2 backup power generators or 2 prioritized power sources and 1 backup power generators) to ensure continuous power supply for steady operation in case of fire.

Permit:

- Situate more than 50 % of N2 stairwells in F1.3 buildings in form of corridors.

- Situate no more than 50 % of N2 or N3 stairwells receiving positive air pressure ventilation in case of fire in F1.1, F1.2, F2, F3 and F4 buildings.

- Situate N2 and N3 stairwells receiving natural lighting and positive air pressure ventilation in F5 class A or B buildings.

...

- Situate N2 or N3 stairwells receiving positive air pressure ventilation in F5 class C or D buildings. When situating L1 stairwells, the stairwells must be separated into compartments by solid fire rated partitions every 20 m in height and passages leading from one compartment to the next compartment of the stairwells must be situated outside of the stairwell spaces.

- For apartment buildings (F1.3) with fire service height taller than 28 m and without exceeding 75 m, and total area of all flats in each storey not exceeding 500 m², may situate 1 evacuation stairwell if evacuation egress(es) of the storey conforms to 3.2.6, flats are equipped with fire alarm devices, each storey is equipped with automatic fire suppression systems and following requirements must be satisfied:

+ Indoor N1 stairwells are utilized in form of corridors;

+ N2 or N3 stairwells are utilized, integrate 1 elevator as fire service elevator in building blocks.

3.4.14. In buildings with smoke proof enclosures, guarantee smoke protection for commonly shared corridors, lobbies, spaces and waiting rooms.

3.4.15. In buildings with fire resistance category I and II and structural fire hazard level S0, may situate type 2 staircases leading from lobbies to the 2^nd storey taking into account 4.26.

3.4.16. In buildings with fire service height not taller than 28 m with fire hazard category by function of F1.2, F2, F3, F4, fire resistance category I, II and structural fire hazard level S0, may use type 2 staircases to connect 2 storeys or more as long as evacuation stairwells conform to standard documents and 4.27.

3.4.17. Escalators must be situated satisfactory to requirements applied to type 2 staircases.

4. FIRE SPREAD PREVENTION

...

- Utilize structure and spatial – clearance planning solutions to prevent further spread of dangerous elements of the fire in a room, between rooms, between groups of rooms with different fire hazard categories by functions, between storeys, between blocks, between fire compartments and between buildings.

- Limit fire and explosion risks related to technology in rooms and buildings;

- Limit fire hazard of construction materials used on surface levels of building structures, including: roofing, finishing layers of outer walls, rooms and evacuation routes.

- Install initial fire extinguishing devices, including automatic and manual devices.

- Install fire detection and alarm devices.

NOTE: Regulations on fire safety distance between buildings, public constructions and manufacturing facilities are specified in Annex E. Distance from storage containing flammable liquid, exposed storage situated above ground containing flammable liquid, tanks containing LPG[1]⁾, and flammable gas to other structures must conform to specialized standards.

4.2. Buildings, dorms, public structures, manufacturing facilities and warehouses must satisfy fire safety requirements under these Regulations and provisions under design regulations applied to each type of construction. Number of storeys (permissible fire service height of buildings), area of fire compartments and maximum height for placement of conference rooms, lecture halls, meeting rooms, sports training spaces, etc. shall conform to regulations under Annex H.

4.3. Building sections (rooms, areas of refuge, mechanical floors, basements, semi-basements and other sections) where fire suppression is difficult must be equipped with additional measures to limit fire area, intensity and duration.

4.4. Effectiveness of measures adopted to prevent fire spread shall be assessed by economic – technical calculation based on requirements of 1.5.1 regarding limiting direct and indirect consequences of the fire.

...

NOTE: Specific requirements for F1.3 buildings:

a) Walls and partitions between units and separating main corridors (outside of flats) from other rooms must have fire-resistance rating no less than El 45.

b) Non-load bearing walls and partitions between flats must have fire-resistance rating no less than El 30 and grade K0 fire hazard.

c) Rooms serving public purposes must be separated with dwellings by class 1 fire resistant partitions and class 3 fire resistant floors; in case of buildings with grade I fire resistance, separate with class 2 fire resistant floors.

4.6. With respect to a building whose sections with different fire hazard levels by functions have been separated by fire prevention devices, each section must satisfy requirements regarding fire safety applied to buildings with similar fire hazard levels by functions.

Fire protection systems must be selected on the basis of: when sections of buildings have different fire hazard levels, fire hazard levels of the whole buildings may be greater than fire hazard levels by functions of any sections thereof.

4.7. With respect to F5 buildings, if the technology allows, situate class A and B rooms near the outer walls; with respect to multi-storey buildings, situate these rooms at upper storeys.

4.8. Do not situate rooms that utilize or store flammable gas and liquid and flammable materials in basements and semi-basements, except for cases specifically considered.

4.9. Construction components must not facilitate hidden fire.

...

4.10. Fire resistance of connecting details of construction components must not be lower than required fire resistance applied to those components.

4.11. Structures creating slopes in auditorium must satisfy fire resistance and fire hazard level requirements according to Schedule 4 and Schedule 5 similar to floors in-between storeys.

4.12. When situating service ducts and cables across walls, floors and partitions, the adjoining section must be sealed or properly processed in order to not reduce fire-related technical standards applied to the components respectively.

4.13. Fireproof coating and impregnation layers applied on exposed surfaces of components must satisfy requirements prescribed for finishing of said components.

Technical documents for fireproof coatings and impregnation layers must specify frequency of replacement or restoration depending on use conditions.

In order to enhance fire resistance or reduce fire hazard level of components, do not use fireproof coatings and impregnation layers in places that cannot be restored or replaced regularly.

4.14. Effectiveness of fireproof substances (materials) for reducing fire risks of materials must be assessed by tests for fire hazard category of construction materials in Section 2.

Effectiveness of fireproof substances (materials) for enhancing fire resistance of materials must be assessed by tests for fire resistance of construction materials in Section 2.

Effectiveness of fireproof substances (materials) not taken into account when determining load-bearing capacity of metal components (pillars or beams) shall be assessed by tests comparing minimized model of pillars with height of exposed fire must not be less than 1.7 m or beam models with length of exposed fire no less than 2.8 m without continuous load.

...

4.15. Hanging ceilings which increase fire-resistance rating of floors between storeys and the roof must conform to fire hazard requirements applicable to floors between storeys and roof. Fire-rated partitions must also separate the space above the hanging ceilings.

Do no situate channels and ducts to carry flammable substances in gas, dust - gas or liquid form and flammable materials.

Hanging ceilings cannot be situated in class A or B rooms.

4.16. At intersection between fire prevention devices with sheltering structures of the buildings including points where building sections are altered, adopt measures to prevent fire from spreading through said places.

4.17. Fire-rated walls for separating buildings into fire compartments must be situated along the height of the buildings and must prevent fire from spreading into adjacent fire compartments when building structures that are on fire collapse.

4.18. Openings in fire prevention devices must be sealed in case of fire.

Windows in fire prevention devices cannot be opened, doors, gates, trapdoors and valves must be equipped with auto closing mechanism and jambs must be tightly wedged. Doors, gates, trapdoors and valves that need to be left open during utilization must be equipped with mechanisms that automatically close said components in case of fire.

4.19. Total area of doorways in fire prevention devices, other than sheltering structures of elevator shafts, must not exceed 25 % of area of said fire prevention devices. Fire-rated doors and valves in fire prevention devices must satisfy requirements under 2.4.3 and requirements under Section 4.

Install buffer spaces receiving positive air pressure ventilation as specified in Annex D in doors of fire prevention devices for separating class A or B rooms from other spaces namely: rooms of classes other than A or B, corridors, staircases and elevator lobbies. Do not situate a buffer space for more than 2 class A or B rooms.

...

In doorways of fire prevention devices between class C, D and E rooms, if unable to close by fire-rated doors or gates, may situate exposed buffer spaces equipped with automatic fire suppression devices. Sheltering structures of the buffer spaces must be appropriate fire prevention structures.

4.21. Fire-rated doors and valves in fire prevention devices must be made from non-flammable materials.

May use materials with flammability no less than Ch3 and protected by non-flammable materials no thinner than 4 mm as fire-rated doors, gates, trapdoors and valves.

Doors of fire-rated compartments, doors, gates and trapdoors in all fire prevention devices of rooms that do not store or use flammable gas, air and materials and do not include technological processes that involve burning dusts may be made from materials with Ch3 flammability with thickness no less than 40 mm and not hollow.

4.22. Do not situate channels, shafts and ducts carrying flammable gas, mixture of flammable dust, flammable liquid, flammable substances and materials across class 1 fire-rated walls and floors.

For channels, shafts and ducts for carrying other substances and materials with types mentioned above, at intersection with the fire prevention devices, install devices that automatically prevent spread of burning products along the channels, shafts and ducts.

NOTE 1: May situate ventilation ducts and chimneys in fire-rated walls of buildings, public constructions and auxiliary buildings if minimum thickness of fire-rated walls (excluding the ducts) is not under 25 cm and thickness of separation layers between chimneys and ventilation ducts is at least 12 cm.

NOTE 2: Openings for placement of water pipes in fire prevention devices must be processed according to 4.12.

4.23. Sheltering structures of elevator shafts (except for shafts mentioned in 3.4.6) and elevator mechanical rooms (other than rooms situated on the roofs), channels, shafts and mechanical panels must satisfy requirements applied to class 1 fire-rated partitions and class 3 fire-rated floors. No regulations on fire-resistance ratings of sheltering structures between elevator shafts and mechanical rooms.

...

In buildings with smoke proof enclosures, equip automatic smoke protection for elevator shafts whose exits are not installed with fire-rated buffer spaces with positive air pressure ventilation in case of fire.

4.24. Garbage rooms, garbage chutes and doors to garbage chute systems must be designed and installed satisfactory to technical standards and requirements applied specifically to said components and following specific requirements:

- Garbage chutes and garbage rooms must be separated from other sections of the buildings by fire prevention devices; doors to garbage chute systems must have fire-rated doors equipped with auto-closing mechanisms.

- Garbage chutes must be made from non-flammable materials.

- Do not place garbage chutes and garbage rooms in stairwells, waiting lounges or buffer spaces coated with fireproof layers for evacuation purposes.

- Rooms containing garbage chutes or garbage must guarantee direct entrance from spacious areas outside of the buildings or via a fire-rated buffer spaces receiving regular ventilation.

- Doors to garbage rooms must not be situated adjacent to evacuation exits or doors leading outside the buildings or near windows of houses.

4.25. Depending on technological advances, may situate staircases separately to allow access between basements/semi-basements with the 1st storey.

These staircases must be covered by class 1 fire-rated partitions and fire-rated buffer spaces receiving positive air pressure ventilation in case of fire.

...

These staircases must not be taken into account when calculating evacuation, except for cases specified in 3.2.1.

4.26. When situating type 2 staircases leading from lobbies on 1^st storey to the 2^nd storey, the lobbies must be separated from adjacent corridors and rooms by class 1 fire-rated partitions.

4.27. Rooms where type 2 staircases according to 3.4.16 are situated must be separated from adjoining corridors and other rooms by class 1 fire-rated partitions. May not separate rooms where type 2 staircases are situated by fire-rated partitions if:

- The whole buildings are equipped with automatic fire suppression devices; or

- Buildings with fire service height no taller than 9 m with area of any storey not exceeding 300 m².

4.28. In buildings/semi-basements, install class 1 fire-rated buffer spaces receiving positive air pressure ventilation in case of ire in front of entrances to elevators.

4.29. Choosing dimensions of buildings, fire compartments and distance between buildings must rely on fire-resistance categories, structural fire hazard levels, fire hazard levels by functions and fire loading values, taking into account effectiveness of used fire protection devices, presence, location and level of equipment of fire brigade, potential economic and ecological consequences due to the fire.

4.30. During operation process, functionality of all technical equipment for fire protection must be guaranteed according to predetermined requirements.

4.31. Installation of automatic fire alarm and suppression must conform to TCVN 3890.

...

5.1. Outdoor hydrant boosters

5.1.1. Fire safety requirements for outdoors hydrant boosters

5.1.1.1. Installation of outdoors hydrant must conform to TCVN 3890 and other revised documents prescribing standards.

5.1.1.2. Water quality of supply sources must conform to operation conditions of firefighting facilities and methods.

5.1.1.3. Water pipes for firefighting are usually maintained at low pressure and only at high pressure when satisfactory to statements. For high pressure pipelines, firefighting pumps must be equipped with mechanisms guaranteeing operation no later than 5 minutes after fire alarms go off.

5.1.1.4. Minimum discharge rate in low-pressure water pipes for firefighting (situated above ground) during firefighting must not be less than 10 m. Minimum discharge rate in high-pressure water pipe systems for firefighting must ensure height of solid stream no less than 20 m in case of maximum firefighting load and fire nozzles situated at the highest point of the buildings. Discharge rate in mixed pipelines must not be lower than 10 m and not higher than 60 m.

5.1.2. Fire safety requirements for water flow rate for outdoor firefighting

5.1.2.1. Water flow rate for outdoor firefighting (for 1 fire) and number of simultaneous fire in a residential area calculated for primary pipe network shall conform to Schedule 7.

5.1.2.2. Water flow rate for outdoor firefighting (for 1 fire) for buildings of fire hazard categories by functions of F1, F2, F3 and F4 calculated for mixed pipelines, distribution pipelines of pipe networks and small scale pipe networks (1 hamlet, 1 block, etc.) shall use the highest value in Schedule 8.

...

NOTE 1: When calculating water flow rate for extinguishing 2 fires, use value of 2 buildings requiring the highest value.

NOTE 2: Water flow rate for outdoor firefighting in independently situated auxiliary buildings shall conform to Schedule 8 similar to buildings with fire hazard level F2, F3 and F4, and in case of manufacturing faculties, calculate according to general volume of manufacturing facilities and Schedule 9.

NOTE 3: Water flow rate for outdoor firefighting in agricultural facilities with fire-resistance categories I and II with volume not exceeding 5 000 m³, fire and explosion hazard class D and E shall equal 5 l/s.

NOTE 4: Water flow rate for outdoor firefighting in radio stations and television stations does not depend of volume of the stations and number of people living in the vicinity of the stations but rather no less than 15 l/s even when Schedule 9 and Schedule 10 specify a lower value.

NOTE 5: Water flow rate for outdoor fire for buildings with volume exceeding values under Schedule 9 and Schedule 10 must comply with special requirements.

NOTE 6: In case of buildings with fire-resistance category II and made from wooden structures, water flow rate for outdoor firefighting shall equal values under Schedule 9 and Schedule 10 plus 5 l/s.

NOTE 7: Water flow rate for outdoor firefighting for buildings and areas of refrigerated food warehouses shall use values of buildings with C level of fire hazard.

Schedule 7 – Water flow rate for outdoor firefighting in residential areas

Population, x 1 000 people

...

Water flow rate for extinguishing 1 fire,
l/s

Buildings no taller than 2 storeys, regardless of fire resistance categories

Buildings of 3 storeys or higher, regardless of fire resistance categories

≤ 1

> 1 and ≤ 5

...

> 5 and ≤ 10

> 10 and ≤ 25

...

> 50 and ≤ 100

> 100 and ≤ 200

...

> 200 and ≤ 300

> 300 and ≤ 400

...

> 500 and ≤ 600

> 600 and ≤ 700

...

> 700 and ≤ 800

> 800 and ≤ 1 000

100

...

110

NOTE 1: Water flow rate for outdoor firefighting in residential area must not be lower than the values in Schedule 8.

NOTE 2: When supplying water regionally, water flow rate for outdoor firefighting and number of simultaneous fire of each region shall depend on population in the region.

NOTE 3: Number of simultaneous fire and water flow rate for 1 fire in a region with more than 1 million in population shall conform to special technical requirements.

NOTE 4: For systems of pipe clusters, number of simultaneous fire shall depend on total population living in the areas connecting to the pipe systems.

Water flow rate for restoring water supply for firefighting by pipe clusters determined by total maximum water amount supplied for residential areas (equivalent to number of simultaneous fire) for firefighting shall conform to 5.1.3.3 and 5.1.3.4.

NOTE 5: Number of simultaneous fire in residential areas to be calculated must include fire occurring in manufacturing facilities and warehouses situated within the residential areas. In that case, calculated water flow rate must also include value for extinguishing fire in said buildings and not be lower than values in Schedule 7.

...

Schedule 8 – Water flow rate for outdoor firefighting in buildings with F1, F2, F3 and F4 fire hazard levels

Type of building

Water flow rate for outdoor firefighting regardless of fire-resistance category, calculating for 1 fire, l/s, for building volume, 1 000 m³

≤ 1

> 1 and ≤ 5

> 5 and ≤ 25

> 25 and ≤ 50

> 50

...

(2)

(3)

(4)

(5)

(6)

1. Category F1.3, F1.4 buildings with one or more blocks and:

...

≤ 2

10¹⁾

> 2 and ≤ 12

...

> 12 and ≤ 16

...

2. Category F1.1, F1.2, F2, F3 and F4 buildings with:

...

≤ 2

10¹⁾

> 2 and ≤ 12

...

> 2 and ≤ 16

...

¹⁾ for residential areas in villages, communes (rural areas), water flow rate for 1 fire shall be 5 l/s.

NOTE 1: If capacity of outdoor pipe networks is not enough to deliver calculated water amount for firefighting or when connecting the pipes to end sections, consider installation of tubs and/or tanks with adequate volume to store water sufficient for outdoor firefighting for 3 hours.

NOTE 2: In residential areas without water pipes for firefighting, install tubs and/or tanks to guarantee firefighting for 3 hours.

...

Building fire-resistance category

Structural fire hazard level

Fire and explosion hazard levels

Water flow rate for outdoor firefighting no wider than 60 m, for 1 fire, l/s, in building volume, 1 000 m³

≤ 3

> 3 and ≤ 5

> 5 and ≤ 20

> 20 and ≤ 50

> 50 and ≤ 200

...

> 400 and ≤ 600

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

...

(10)

I and II

S0, S1

D, E

...

I and II

S0, S1

A, B, C

...

III

S0, S1

D, E

...

III

S0, S1

A, B, C

...

S0, S1

D, E

...

S0, S1

A, B, C

...

S2, S3

D, E

...

S2, S3

...

D, E

...

Schedule 10 – Water flow rate for outdoor firefighting in F5 buildings

ire-resistance category of buildings

Structural fire hazard level of buildings

Fire and explosion fire hazard level of buildings

Water flow rate for outdoor firefighting in buildings wider than 60 m, calculated for 1 fire, l/s, in building volume, 1 000 m³

≤ 50

> 50 and ≤ 100

...

> 200 and ≤ 300

> 300 and ≤ 400

> 400 and ≤ 500

> 500 and ≤ 600

> 600 and ≤ 700

> 700 and ≤ 800

I and II

A, B, C

...

100

I and II

...

D, E

...

5.1.2.4. Water flow rate for outdoor firefighting separated with fire-rated walls shall depend on sections of the buildings that require the largest amount.

5.1.2.5. Water flow rate for outdoor firefighting separated by fire-rated walls shall be determined by overall volume of the buildings and the highest value of fire and explosion hazard level.

5.1.2.6. Water flow rate for firefighting must be guaranteed even when other water demand is most needed, specifically:

- Domestic water.

- Individual business households.

- Industrial and agricultural manufacturing facilities where drinking water quality or economic purposes are inadequate for installation of separate pipelines.

- Water treatment stations, pipe and duct networks, etc.

- In case technological advances allow, may use part of water for manufacturing for firefighting, connect hydrants of manufacturing pipe networks with hydrants of firefighting pipe networks to guarantee adequate amount of water for firefighting.

5.1.2.7. Water supply systems for firefighting (water pipes, pumping stations, tanks and tubs containing water for firefighting) must supply water continuously for more than 10 minutes and must not reduce flow rate more than 30 % of calculated values for 3 days.

...

5.1.3. Calculated number of simultaneous fire

5.1.3.1. Number of simultaneous fire of an agricultural facility must be calculated based on area of the facility, to be specific:

- Consider as 1 fire if the facility is as large as 150 ha.

- Consider as 2 fires if the facility is larger than 150 ha.

NOTE: Number of simultaneous fire calculated for an exposed storage area containing wooden materials shall be as follows: consider as 1 fire if the facility is as large as 50 ha; consider as 2 fires if the facility is larger than 50 ha.

5.1.3.2. When merging pipelines of a residential area and an industrial facility situated outside of the residential area, number of simultaneous fire shall be calculated as follows:

- When the industrial area is as large as 150 ha and population of the residential area is 10 000 people, consider as 1 fire (apply the higher value of water flow rate); and with population ranging from 10 000 to 25 000 people, consider as 2 fires (1 fire for the industrial facility and 1 fire for the residential area).

- When an industrial area is larger than 150 ha with population of 25 000 people, consider as 2 fires (2 fires for the industrial area or 2 fires for the residential area, whichever side requires more water).

- When the population exceeds 25 000 people, consider as 2 fires where water flow rate of 1 fire shall equal total flow rate of the higher demand (of industrial facility or residential area) and 50 % of the lower demand (of industrial facility or residential area).

...

- With respect to buildings of fire resistance category I, II with structures and thermal insulation layers made from non-flammable materials and areas of fire hazard level D and E, the firefighting duration shall be 2 hours.

- With respect to exposed storage containing wooden materials, the firefighting duration must not be less than 5 hours.

5.1.3.4. The maximum amount time to restore amount of water for firefighting must not be more than:

- 24 hours for residential areas and industrial areas with areas under fire hazard level A, B and C.

- 36 hours for industrial facilities with areas under fire hazard level D and E.

- 72 hours for residential areas and agricultural facilities.

NOTE 1: With respect to industrial facilities that require up to 20 l/s for outdoor firefighting, may increase maximum amount of time to restore water for firefighting as follows:

- Up to 48 hours for areas under fire hazard level D and E.

- Up to 36 hours for areas under fire hazard level C.

...

In which: t_tt – actual period of restoring water for firefighting.

t_td – period of restoring water for firefighting (according to 5.1.3.4).

5.1.4. Fire safety requirements for pipe networks and constructions performed thereon

5.1.4.1. When installing 2 supply pipes or more, must install valves to switch between the pipes so in case 1 supply pipe is entirely or partially closed, firefighting is still 100 % guaranteed.

5.1.4.2. Pipeline network carrying water for firefighting must be circular network. May install dead end pipes in case of: supplying water for firefighting or daily routines and firefighting if the length of the pipelines does not exceed 200 m regardless of required water flow rate for firefighting.

Do not install circular network of outdoor pipe networks with indoor pipe networks.

NOTE: In residential areas with population of up to 5 000 people and requiring up to 10 L/s water flow rate for firefighting or having up to 12 indoor hydrants, may use dead end networks longer than 200 m if tanks, tubs, pressure towers or circulating baths are constructed for dead end networks which contain the whole amount of water for firefighting.

5.1.4.3. Valves on pipelines regardless of diameters that are remotely or automatically controlled must be electrically controlled.

...

In case of not being remotely or automatically controlled, valves with up to 400 mm in diameter can be manually locked, valves with more than 400 mm in diameter can be locked electrically or by hydraulics; in special cases, may install manual valves with more than 400 mm in diameter.

In all cases, must allow manual operation.

5.1.4.4. Diameter of supply pipelines and the network after the supply pipelines must be calculated based on:

- Technical and economic factors.

- Working conditions in case accidents interrupt different sections.

Diameter of outdoor firefighting pipelines in residential areas and manufacturing facilities must not be less than 100 mm, in rural areas – not smaller than 75 mm.

5.1.5. Requirements for tubs and tanks storing water for outdoor firefighting

5.1.5.1. Functions of tubs and tanks providing water must include circulating, firefighting, occurring of incidents and containing of feed water.

5.1.5.2. If collection of water for firefighting directly from water sources does not conform to economic and technical conditions, tanks and tubs must contain adequate calculated amount of water for firefighting.

...

- Provision of water for firefighting from outdoor hydrant boosters and other fire suppression systems;

- Provision of water for specialized fire suppression devices (sprinklers, drenchers, etc.) that do not have separate tanks.

- Maximum water amount for daily routines and manufacturing during firefighting process.

5.1.5.4. Reservoir providing water for fire engines must have access and parking lots with dimensions of no smaller than 12 m x 12 m and surfaces capable of withstanding load of fire engines.

NOTE: When determining volume of water for firefighting in tubs and tanks, may take into account refilling the tubs and tanks during firefighting process in case of water supply systems satisfactory to 5.1.2.7.

5.1.5.5. When supplying water via 1 pipeline, prepare back up water for firefighting, the amount of water shall conform to 5.1.5.3.

NOTE: May not take into account the backup water if the length of a supply pipeline does not exceed 500 m in a residential area with less than 5 000 people and entities requiring no more than 40 l/s of water for outdoor firefighting.

5.1.5.6. Total number of tanks and tubs for firefighting in a pipe network must not be less than 2 (does not apply to tanks and tubs for outdoor water supply of independent structures).

The minimum and maximum level of water for firefighting among all tubs and tanks in the same network must be the same.

...

5.1.5.7. Storage of water in tubs and tanks or exposed tanks is permitted in case of:

- A residential area with up to 5 000 people.

- Buildings, regardless of purposes, situated separately outside of residential areas having no pipe networks for supplying water for daily routines or manufacturing and for supplying necessary water amount for outdoor hydrant boosters.

- Multi-purpose buildings requiring no more than 10 l/s of water for outdoor firefighting.

- Buildings with 1 to 2 storeys, regardless of functions, having construction area no larger than area of fire compartments applied to the building types.

5.1.5.8. Amount of water for firefighting of tubs, tanks and man-made reservoirs shall be determined based on calculation of amount of water consumed and duration of firefighting according to 5.1.2.2 through 5.1.2.6 and 5.1.3.3.

NOTE 1: When calculating volume of water for firefighting of man-made reservoirs, must take into account possibilities of evaporation and freezing of water. Minimum water level must not be less than 0.5 m.

NOTE 2: Must ensure access for fire engines.

5.1.5.9. Tanks, tubs, outdoor hydrant boosters, natural and man-made reservoirs for firefighting must be situated within following radius:

...

- 100 m to 150 m within technical operation range of mobile pumps in case of mobile pumps.

- In order to increase operation radius, may install dead end pipes no longer than 200 m from the tanks, tubs and man-made reservoirs satisfactory to 5.1.5.8.

- Distance from points of collecting water in tanks, tubs or man-made reservoirs to buildings with fire-resistance category of III, IV and V or to exposed warehouses containing flammable materials must not be less than 30 m, to buildings with fire resistance category of I and II must not be less than 10 m.

5.1.5.10. If unable to suck water for firefighting directly from tanks, tubs or reservoirs by pump trucks or mobile pumps, provide basins with volume ranging from 3 m³ to 5 m³. Diameter of pipes connecting tubs, tanks or reservoirs with the basins shall be calculated based on factors of calculating water flow rate for outdoor firefighting but no less than 200 mm. Valve boxes must be installed on pipelines to lock water circulation, closing and opening of valves must be performed from the outside of the boxes. The pipe ends located in man-made reservoirs must be installed with sieves.

5.1.5.11. Pressure tanks and tubs for firefighting must be equipped with water level meters, devices reporting water level to pump stations or water distribution stations.

Pressure tanks and tubs of high-pressure pipelines for firefighting must be equipped with devices that automatically stop water from being carried to tubs, tanks and water towers when firefighting pumps are operating.

5.1.5.12. Pressure tanks and tubs that use pressurized compressed air must have back up pressurizing machines in addition to active pressuring machines.

5.2. Indoor fire hydrant systems

5.2.1. Buildings, public buildings and administrative – auxiliary buildings of industrial constructions must be equipped with indoor fire hydrant systems, minimum water flow rate for firefighting is determined according to Schedule 11, in case of manufacturing facilities and warehouses, consult Schedule 12.

...

NOTE: In case fire hydrants use equipment with specification not mentioned under Schedule 13, guarantee minimum water flowrate for firefighting of a stream and height of solid stream as per the law.

5.2.2. For calculation of pump capacity and reserved water for firefighting, number of streams and water flow rate for firefighting in sections of public buildings that are situated at a height above 50 m must be 4 streams and 2.5 l/s per stream. With respect to F5 buildings with A, B or C fire hazard category with volume exceeding 50 000 m3, must be 4 streams and 5 l/s per stream.

Schedule 11 – Number of streams and minimum water flow rate for indoor fire hydrant systems

Residential buildings and public structures

Number streams per storey

Minimum flow rate for indoor firefighting, L/s, of 1 stream

1. Residential buildings, apartment buildings

≥ 5 and ≤ 16 storeys, when main corridors ≤ 10 m

...

≥ 5 and ≤ 16 storeys, when main corridors > 10 m

2.5

> 16 and ≤ 25 storeys, when main corridors ≤ 10 m

2.5

> 16 and ≤ 25 storeys, when main corridors > 10 m

2.5

...

≥ 6 and ≤ 10 storeys and volume of ≤ 25 000 m³

2.5

≥ 6 and ≤ 10 storeys and volume of > 25 000 m³

2.5

> 10 storeys and volume of ≤ 25 000 m³

...

2.5

> 10 storeys and volume of > 25 000 m³

2.5

3. Club rooms containing stages, theatres, cinemas, and rooms equipped with audiovisual devices (conference rooms, seminar rooms, etc.)

≤ 300 seats

...

> 300 seats

5.0

4. Dorms and public buildings (except Section 2)

≥ 6 and ≤ 10 storeys and volume of < 5 000 m³ or < 10 storeys and volume of ≥ 5 000 m³ and ≤ 25 000 m³

2.5

...

2.5

> 10 storeys and volume of ≤ 25 000 m³

2.5

> 10 storeys and volume of > 25 000 m³

2.5

5. Administrative – auxiliary buildings of industrial structures with volume

...

≥ 5 000 and ≤ 25 000 m³

2.5

> 25 000 m³

2.5

5.2.3. With respect to manufacturing facilities and warehouses constructed from materials that are prone to damage of fire, minimum water flow rate for determining pump capacity and amount of water reserved for firefighting specified in Schedule 12 must be increased in following cases:

- In case of steel structures that do not receive fire protections in buildings of fire-resistance category III, IV (level S2, S3), as well structures made from natural wood or pressed wood (which is wood that have been processed for fire protection), increase by 5 l/s.

...

Schedule 12 – Number of streams and minimum water flow rate for indoor firefighting in manufacturing facilities and warehouses

Fire-resistance categories of buildings

Fire and explosion hazard level of buildings

Minimum number of streams and water flow rate, l/s, for 1 stream, for indoor firefighting in manufacturing facilities and warehouses up to 50 m in height and by volume, 1 000 m³

≤ 0.5 and ≤ 5

> 5 and ≤ 50

> 50 and ≤ 200

> 200 and ≤ 400

...

(1)

(2)

(3)

(4)

(5)

(6)

(7)

I, II

A, B, C

...

2 x 5

3 x 5

4 x 5

III

2 x 2.5

2 x 5

...

¹⁾

III

D, E

²⁾

2 x 2.5

¹⁾

IV, V

...

2 x 2.5

2 x 5

¹⁾

IV, V

D, E

²⁾

2 x 2.5

...

¹⁾

¹⁾Water flow rate and number of streams must be developed based on special technical documents.

²⁾No streams required.

NOTE 2: With respect to buildings whose fire-resistance ratings and fire hazard levels are not specified in Schedule 12, water flow rate shall conform to special technical documents.

Schedule 13 - Flow rate of water for firefighting depending on height of solid streams and diameter of nozzles

Height of solid stream, m

Flow rate of nozzles, L/s

...

Flow rate of nozzles, L/s

Pressure, MPa, of fire hydrants with length of roller, m

Flow rate of nozzles, L/s

Pressure, MPa, of fire hydrants with length of roller, m

...

(1)

(2)

(3)

(4)

(5)

(6)

...

(8)

(9)

(10)

(11)

(12)

(13)

Diameter of nozzle, mm

...

DN 50 fire hydrant ¹⁾

2.6

0.092

...

0.100

3.4

0.088

0.096

0.104

...

2.9

0.120

0.125

0.130

4.1

0.129

0.138

0.148

...

3.3

0.151

0.157

0.164

4.6

0.160

...

0.185

2.6

0.202

0.206

0.210

3.7

0.192

0.196

...

5.2

0.206

0.223

0.240

2.8

0.236

0.241

0.245

...

0.248

0.255

0.263

3.2

...

0.322

0.328

4.6

0.293

0.300

0.318

...

3.6

0.390

0.398

0.406

5.1

0.360

0.380

0.400

...

DN 65 fire hydrant ¹⁾

...

2.6

0.088

0.089

0.090

3.4

0.078

0.080

0.083

...

2.9

0.110

0.112

0.114

4.1

0.114

...

0.121

3.3

0.140

0.143

...

4.6

0.143

0.147

0.151

2.6

0.198

0.199

0.201

...

0.180

0.183

0.186

5.2

0.182

0.190

0.199

2.8

...

0.231

0.233

4.2

0.230

0.233

0.235

5.7

0.218

0.224

...

3.2

0.31

0.313

0.315

4.6

0.276

0.280

0.284

...

0.266

0.273

0.280

3.6

0.38

0.383

0.385

5.1

...

0.342

0.346

7.0

0.329

0.338

0.348

4.0

0.464

...

0.470

5.6

0.412

0.424

0.418

7.5

0.372

0.385

0.397

...

5.2.4. Number of firefighting streams for each fire shall be 2 streams for buildings that require more than 2 streams.

5.2.5. With respect to building sections with different purposes, water flow rate for firefighting must be separately calculated for each section according to 5.2.1 and 5.2.2. In that case, water flow rate for indoor firefighting shall be calculated as follows:

- With respect to buildings that are not separated by fire-rated walls, calculate based on general volume.

- With respect to buildings separated by class 1 or 2 fire-rated walls, calculate based on volume of building sections that require the highest water flow rate.

When connecting buildings of fire-resistance category I and II by passages made from non-flammable materials and equipped with fire-rated doors, volume of buildings serving determination of water flow rate for firefighting shall be volume of individual buildings; in case of no fire-rated doors, calculate based on overall volume and the higher fire hazard levels.

5.2.6. Hydrostatic pressure in domestic – firefighting water systems measured in sanitation – technical equipment situated at the lowest elevation must not exceed 0.45 MPa.

Hydrostatic pressure of separate fire suppression systems measured in fire hydrants situated at the lowest elevation must not exceed 0.90 MPa.

During calculation, if pressure in fire suppression systems exceeds 0.45 MPa, install separate fire suppression systems.

NOTE: When pressure between valves and connecting ends of fire hydrants exceeds 0.4 MPa, install separation layers and devices that adjust pressure to lower excess pressure.

...

- No less than 6 m in case of residential buildings, public buildings, manufacturing facilities and auxiliary buildings of industrial structures up to 50 m of fire service height.

- No less than 8m in case of residential buildings with fire service height taller than 50 m.

- No less than 16 m in case of residential buildings, public buildings, manufacturing facilities and auxiliary buildings of industrial structures exceeding 50 m of fire service height.

NOTE 1: Pressure of fire hydrants must take into account losses due to fire hose rollers with 10 m, 15 m and 20 m in length.

NOTE 2: To receive solid streams with up to 4 L/s of flow rate, use DN 50 fire hydrants and DN 65 hydrants for higher flow rate. In case economic – technical documents permit, may use DN 50 hydrants for flow rate exceeding 4 L/s.

5.2.8. Pressure tanks in buildings must be designed to ensure generation of solid stream taller than 4m at the highest storey or at the storey situated immediately below the storey where the tanks are placed and must not be less than 6 m for remaining storeys; in that case, ensure 2 streams with flow rate of 2.5 l/s in 10 minutes if number of calculated streams is 2 or more and 1 stream in other cases.

When installing fire hydrants as sensors for automatic operation of firefighting pumps, consideration to pressure tanks is not required.

5.2.9. In case of installing fire hydrant systems separately from automatic fire suppression systems, volume of reservoir tanks containing water must provide enough water to be used in 1 hour for firefighting and other purposes.

When installing fire hydrant systems on automatic fire suppression systems, working duration of the hydrant shall equal the working duration of the fire suppression systems.

...

Dry pipes of fire suppression systems installed in buildings that are not heated, valves must be installed in places where the valves cannot be frozen.

5.2.11. Determination of location and number of indoor vertical pipes and fire hydrants must satisfy following requirements:

- May install double hydrant on vertical pipes in manufacturing facilities and public buildings when number of calculated streams is not less than 3 and in residential buildings when number of calculated streams is not less than 2.

- In residential buildings with corridors reaching up to 10 m in length and 2 streams per fire, may generate 2 streams from the same vertical pipes.

- In residential buildings with corridors reaching up to 10 m as well as manufacturing facilities and public buildings with 2 calculated streams or more per fire, ensure 2 streams from 2 adjacent cabinets (2 different fire hydrants).

NOTE 1: Must install fire hydrants in mechanical floor, garrets and technical floors located in basements if objects and structures made from flammable materials are stored in such places.

NOTE 2: Number of streams generated from each cabinet must not exceed 2.

5.2.12. Fire hydrants must be installed in a fashion that hydrant openings are situated at an elevation of 1.20 m ± 0.15 m compared to the floor and in cabinets with ventilation outlets and applied with seal. With respect to double hydrant, may install the hydrants vertically, in that case, the lower hydrant must be at least 1 m from the floors.

5.2.13. With respect to buildings with 17 storeys or taller, landing valves must be installed in indoor fire hydrant systems of each section with proper dimension of outlets to connect with mobile fire-fighting facilities. The landing valves must be installed with check valves and open seal.

...

5.2.15. In areas protected by automatic fire suppression systems, may install indoor fire hydrants on DN 65 pipes or larger, after control valve clusters of water sprinkler systems.

5.2.16. In closed areas where water can be frozen, pipes of indoor hydrant systems after the pump stations may be dry pipes.

5.2.17. Valves to cut water from dead end branching pipes and major cut valves from enclosed steel pipelines must be situated in a manner that each section shall only cut water from a maximum of 5 hydrants located on the same storey.

5.2.18. If more than 12 hydrants or automatic fire suppression systems are installed in buildings, both independent and integrated indoor water supply systems for firefighting must have at least 2 water supply pipes and must be connected in a circular model.

6. FIREFIGHTING AND RESCUE

6.1. Buildings and constructions must guarantee firefighting and rescue by adopting solutions regarding: structures, premise - spatial distribution, technical - construction and organization.

The solutions include:

- Prepare fire access; parking lots for fire engines and access for fire brigade and fire-fighting facilities which are integrated with road and passages depending on building functions or situated separately.

- Situate fire ladders outside of buildings and prepare other necessary facilities to provide fire brigade and firefighting technical equipment with access to storeys and garrets of buildings, which includes elevators that are installed with “fire brigade transportation” (hereinafter referred to as “fire service elevators”).

...

- Ensure smoke protection for passages enabling fire brigade to move within the buildings;

- Furnish the buildings with medical emergency equipment for personal use and group use where necessary;

- Distribute and develop constructions, fire brigade and stations suitable for number of employees and necessary firefighting technical equipment, satisfactory to firefighting conditions in buildings or areas of operation of the brigade and stations as per the law.

The solutions mentioned above shall be selected based on fire-resistance categories, structural fire hazard levels and fire hazard categories by functions of buildings.

6.2. Fire access and parking lots for fire engines must satisfy following requirements:

6.2.1. General requirements

a) Clearance width of fire access for fire engines must not be less than 3.5 m.

b) Clearance width of parking lots for fire engines must ensure accessibility for deployment of fire-fighting facilities satisfactory to fire service height and fire hazard of buildings mentioned in Schedule 14.

Schedule 14 - Regulations on dimensions of parking lots for firefighting

...

Dimensions of parking lots for fire engines, m, based on height of buildings, m

≤ 15

> 15 and ≤ 28¹⁾

> 28

1. F1.3 buildings

...

Not required

≥ 6

b) Length of parking lots for fire engines

Not required

≥ 15

2. Other building levels

...

a) Width of parking lots for fire engines

Not required

≥ 6

b) Length of parking lots for fire engines

Consult Schedule 15 and Schedule 16

¹⁾ Parking lots for fire engines are not required for buildings with no more than 50 people on each storey, according to Schedule G.9 (Annex G), and distance from fire access for fire engines to the hydrant boosters no more than 18 m.

c) Only allow obstacles to be placed on fire access and parking lots for fire engines if all following requirements are satisfied:

...

- Dimensions of overhead obstacles (measured along length of fire access and parking lots for fire engines) must not exceed 10 m; and

- In case of 2 or more overhead obstacles stretching across fire access or parking lots for fire engines, clearance space between the obstacles must not be lower than 20 m; and

- Length of ends of fire access or parking lots for fire engines unobstructed by overhead obstacles must not be lower than 20 m; and

- Length of parking lots for fire engines must not take into account sections with overhead obstacles.

d) Along outer walls of buildings, install entrances to the buildings via the outer walls from elevated positions (elevated entrances) satisfactory to 6.3 to deploy firefighting and rescue activity.

6.2.2. Fire access and parking lots for fire engines must be situated in a manner that satisfies following requirements:

6.2.2.1. F1, F2, F3 and F4 buildings with fire service height no taller than 15 m are not required to have parking lots for fire engines but are required to have driveways no larger than 60 m to grant fire engines with access to any point on plan projections of the buildings

6.2.2.2. F1.3 buildings with fire service height taller than 15 m must fulfill all following requirements:

- Install fire access no further than 18 m from the furthest point of entrances leading to buffer spaces of fire service elevators or evacuation stairwells equipped with 65 fire hydrants for professional fire brigade (of dry systems).

...

- Design of parking lots and driveways for fire engines must satisfy regulations under Article 14.

6.2.2.3. F1.1, F1.2, F2, F3 and F4 buildings or sections thereof with fire service taller than 15 m must have a parking lot for fire engines at each area where an elevated entrance is situated to provide fire engines with access to doorways of the elevated entrance. Length of parking lots for fire engines must conform to Schedule 15 based on accessible floor area of the storey with the highest accessible floor area. In case of buildings with bi-level floors, the value shall be calculated as follows:

a) With respect to buildings with multi-level floors, including basements merged with above-ground storeys, accessible floor area shall equal sum of area of all accessible floors of all storeys.

b) With respect to buildings with at least 2 groups of multi-level storeys, accessible floor area shall equal sum of area of accessible floors with the highest values.

6.2.2.4. F5 buildings must have parking lots for fire-fighting facilities. Length of parking lots for fire engines must conform to Schedule 16 based on total volume of the buildings (excluding basements).

If manufacturing conditions do not require entrances, may utilize 3.5 m wide driveway as fire access with surface reinforced with materials guaranteeing load-bearing capacity and drainage of surface water.

Distance from edge of fire access to walls of buildings must not exceed 5 m for buildings with fire service height below 12 m, not exceed 8 m for buildings with fire service height ranging from 12 m to 28 m, and not exceed 10 m for buildings with fire service height taller than 28 m.

If necessary, distance from the nearest edge of driveways to the buildings to outer walls of the buildings and construction shall be increased up to 60 m provided the buildings and constructions are led to by dead ends and installed with parking lots for fire engines and fire hydrants. In that case, distance from buildings and constructions to parking lots for fire engines must not be less than 5 m and no larger than 15 m and distance between dead ends must not exceed 100 m.

NOTE 1: Width of buildings and constructions shall be determined based on distances between reference axes.

...

Schedule 15 – Regulations on length of parking lots for fire engines in F1.1, F1.2, F2, F3 and F4 buildings or sections thereof

Accessible floor area, m²

Required length of parking lots for fire engines, according to building circumference, m

Buildings not protected by sprinkler systems

Buildings protected by sprinkler systems

≤ 2 000

1/6 building circumference and no smaller than 15 m

> 2 000 and ≤ 4 000

...

1/6 building circumference and no smaller than 15 m

> 4 000 and ≤ 8 000

1/2 building circumference

1/4 building circumference

> 8 000 and ≤ 16 000

3/4 building circumference

1/2 building circumference

> 16 000 and ≤ 32 000

The whole building circumference

...

> 32 000

The whole building circumference

Schedule 16 – Regulations on length of parking lots for fire engines in F5 buildings or sections thereof

Compartment volume, m³

Required length of parking lots for fire engines, according to building circumference, m

Buildings not protected by sprinkler systems

Buildings protected by sprinkler systems

...

1/6 building circumference and no smaller than 15 m

> 28 400 and ≤ 56 800

1/4 building circumference

1/6 building circumference and no smaller than 15 m

> 56 800 and ≤ 85 200

1/2 building circumference

1/4 building circumference

> 85 200 and ≤ 113 600

...

1/4 building circumference

> 113 600 and ≤ 170 400

The whole building circumference

1/2 building circumference

> 170 400 and ≤ 227 200

The whole building circumference

3/4 building circumference

> 227 200

The whole building circumference

...

6.2.2.5. Situate fire access and parking lots for fire engines in multi-purpose buildings in a manner that must satisfy following requirements:

a) If non-residential storeys (not included in F1.3) are only situated at the lower sections of buildings, fire service height for determination of requirements for fire access or parking lots for fire engines must be based on non-residential sections of the buildings.

b) In case of multi-purpose buildings that do not have any sections under category F1.3, the required lengths applied to fire access or parking lots for fire engines must be the larger value of the two which are determined based on:

- Total compartment volume of F5 sections of buildings; or

- Schedule 15.

c) With respect to multi-purpose buildings with F1.3 sections, length of parking lots for fire engines must be calculated based on 6.2.2.3 while satisfying requirements in 6.2.2.

6.2.2.6. In case of basements, install fire access no further than 18 m away from all above-ground entrances leading to buffer spaces of fire service elevators or evacuation stairwells equipped with 65 fire hydrants for professional fire brigade (of dry systems).

6.2.3. Parking lots for fire engines must guarantee that the horizontal distance from edges of the parking lots that are nearest to the buildings to the middle point of elevated entrances is no closer than 2 m and no further than 10 m.

6.2.4 Surfaces of parking lots for firefighting must be even. If situated on a tilted surface, slope must not exceed 1:15. Slope of driveways for fire engines must not exceed 1:8.3.

...

6.2.6. Public roads can be used as parking lots for fire engines, if positioning of said roads conforming to regulations on distances to elevated entrances under 6.2.3.

6.2.7. Fire access and parking lots for fire engines must be clear at all time. Spaces between parking lots for fire engines and elevated entrances must not be obstructed by trees or other immovable objects.

6.2.8. Mark all corners of fire access and parking lots for fire engines other than public roads utilized as fire access or parking lots for fire engines. Marking must be implemented by reflective paints to ensure visibility at night and positioned at both sides of fire access or parking lots for fire engines no further than 5 m.

At the beginning and end sections of fire access or parking lots for fire engines, install warning signs with white background, red letters and height of each letter not less than 50 mm. Height from ground level to the lowest points of the signs must range from 1.0 m to 1.5 m. Signs must be visible at night and must not be more than 3 m away from fire access or parking lots for fire engines. All parts of fire access or parking lots for fire engines must not be more than 15 m away from the nearest signs.

6.2.9. Surfaces of fire access and parking lots for fire engines must be able to withstand vehicular weight of the fire engines according to design requirements and satisfactory to vehicle types of Police Departments of Fire Prevention and Fighting and Rescue where the constructions are built.

6.3. Elevated entrances for firefighting and rescue must satisfy following requirements:

6.3.1. Elevated entrances must be clear and unobstructed at any given time when the buildings are being occupied. Elevated entrances can be openings on outer walls, windows, balcony doors, glass walls and doors that can be opened from inside and outside. Do not situate any objects or obstacles on the floors inside the buildings within 1 m from the elevated entrances.

6.3.2. Elevated entrances must be positioned opposite from usable spaces. Evaluated entrances must not be situated in warehouses, mechanical rooms, evacuation stairwells, smokeproof enclosures, lobbies of fire service elevators or spaces that lead to dead ends.

6.3.3. Outer surface of doors of elevated entrances must be marked with red or yellow equilateral triangles whose sides are not smaller than 150 mm and peaks can be directed upwards or downwards. On the inside, place the following phrase “LỐI VÀO TỪ TRÊN CAO – KHÔNG DƯỢC GÂY CẢN TRỞ” (Elevated entrances – Do not obstruct) with letter height no less than 25 mm.

...

6.3.5. Number and position of elevated entrances for each fire compartment of buildings or building sections not included in category F1.3 must satisfy following requirements:

6.3.5.1. In case of F1.1, F1.2, F2, F3, F4 and F5 buildings, number of elevated entrances must be calculated based on length of parking lots for fire engines. Situate 1 elevated entrance for every section of parking lots for fire engines of or less than 20 m in length.

6.3.5.2. Elevated entrances must be positioned distant remote from each other along the sides of buildings. The furthest distance along outer walls between 2 consecutive elevated entrances served by 1 parking lot for fire engines must not exceed 20 m. At least 1 elevated entrance must be guaranteed for every 20 m in length of parking lot for fire engines, except for sections of single storey buildings not included in category F5.

6.3.5.3. With respect to F1.1, F1.2, F2, F3 and F4 buildings with fire service height ranging from 10 m to 50 m, situate elevated entrances on all storeys other than the 1st storey and opposite from parking lots for fire engines.

6.3.5.4. With respect to F5 buildings, situate elevated entrances above parking lots for fire engines with fire service height of up to 50 m.

6.3.5.5. Requirements for elevated entrances do not apply to F1.3 buildings, including auxiliary areas (e.g. gyms, clubs, etc. areas serving the buildings’ inhabitants).

6.4 U-turn spaces must be designed as:

- Equilateral triangles whose sides are not less than 7 m, one vertex is situated at the dead end road and 2 other vertexes are situated symmetrically on both sides of the roads; or

- Squares whose sides are not less than 12 m; or

...

- Rectangles perpendicular to the dead end roads, symmetrical on both sides of the roads and no smaller than 5 m x 20 m.

NOTE: Requirements mentioned above are minimum values, fire prevention and fighting and rescue managing agencies may issue specific regulations based on technical requirements of local fire-fighting facilities.

6.5. With respect to narrow roads only sufficient for 1 lane, design expanded sections that are at least 7 m in width and 8 m in length every 100 m to enable fire engines and other vehicles to avoid each other with ease.

6.6. With respect to buildings that are 10 m in fire service height or taller calculated up to valances or upper points of outer walls, install exits leading to the roofs directly from stairwells, through garrets, through type 3 stairwells or along external fire escapes.

Number of exits leading to the roofs and positioning thereof must be based on fire hazard categories by functions and dimensions of the buildings but no less than 1 exit for:

- Every section that equals or is less than 100 m in length of buildings with garrets.

- Every area that equals or is less than 1 000 m² of roofs of F1, F2, F3 and F4 buildings having no garrets.

- Every 200 m of circumference of F5 buildings along transport methods serving firefighting.

May not situate:

...

- Exits leading to the roofs of single-storey buildings with roof area no larger than 100 m².

6.7. In garrets of buildings other than F1.4 buildings, exits leading to the roofs via fixed staircases and doors, trapdoors or windows no smaller than 0.6m x 0.8m must be installed.

Exits leading to the roofs or garrets from stairwells must be allocated along treads with landings in front of the exits, through type 2 fire-rated doors no smaller than 0.75 m x 1.5 m. The treads and landings mentioned above may be made from steel but must have slope no higher than 2 : 1 (63.5o) and no narrower than 0.7 m.

In F1, F2, F3 and F4 buildings that are up to 15 m in fire service height, may situate exits leading to garrets or to the roofs from stairwells via type 2 fire-rated trapdoors with dimensions of 0.6 m x 0.8 m following fixed steel ladders.

6.8. In mechanical floors including mechanical floors in basements and garrets, clearance height of passages must not be less than 1.8 m; in mechanical floors in garrets along the entire buildings, no less than 1.6 m. Width of said passages must not be less than 1.2 m. In separate sections with no more than 2 m in length, may reduce height of the passages down to 1.2 m and width to a minimum of 0.9 m.

6.9. Buildings with garrets must have trapdoors in structures sheltering corners of the garrets.

6.10. In areas where height differences of the roofs exceed 1.0 m (which include elevated areas for skylights – ventilation openings), firefighting transport methods must be installed.

At areas where height differences of the roofs exceed 10 m, if each roof section larger than 100 m² has separate exits leading to the roofs satisfactory to 6.6, or height of the lower sections of the roofs identified according to 6.6 does not exceed 10 m, may not install firefighting transport methods.

6.11. Must use P1 firefighting transport methods to reach areas at a height of 20 m and areas of the roofs where height differences range from 1.0 m to 20 m. P2 fire service elevators must be used to reach height above 20 m and areas with height difference of more than 20 m.

...

6.12. Ensure a space between stairs and handrails thereof with clearance width no less than 100 mm when projected on a flat surface.

6.13. At least 1 fire service elevator must be installed in each fire compartment of buildings with fire service height taller than 28 m (50 m for F1.3 buildings) or buildings with the lowest basements situated at a depth greater than 9 m (calculate down to elevation of evacuation exits leading outside).

NOTE: Other technical requirements namely power supply, control, signal transmission, communication and equipment serving fire protection systems, etc. must conform to technical standards applied solely to fire service elevators.

Location and installation of fire service elevators must satisfy following basic requirements:

- Do not use elevators for cargo transportation as fire service elevators.

- In normal conditions, fire service elevators can be used for passenger transportation. Fire service elevators may be situated with separate elevator lobbies or in lobbies shared with passenger elevators and integrated by a single automatic group control system.

- Fire service elevators must be installed in adequate number to ensure that distance from a fire service elevator to any point on the storey accessible by that elevator does not exceed 60 m.

- In case of a building with a single fire service elevator, that fire service elevator must be able to access all storeys adjacent to the storey that is on fire.

- In case of multiple fire service elevators situated in the same elevator shafts, the elevators may grant access to different building sections provided that sections accessible by a fire service elevator are displayed on that elevator.

...

- In case of refuge floors, each refuge floor must be granted access to by at least 1 fire service elevator.

- In normal operation conditions, doors of fire service elevators shall not be opened in order to grant access to refuge floors and doors leading to elevator shafts from the refuge floors must be locked and shall only be unlocked when fire service mode is turned on.

- In case of fire, fire service elevators must be able to enable fire brigade:

+ to be the only individuals capable of controlling and operating while carrying their equipment to access the fire easily, safely, quickly and in a familiar fashion.

+ to be protected while using the elevators from impact of fire and smoke via appropriate measures, particularly when the fire brigade exits from the elevators.

+ to have clear and safe passages to access the fire service elevators and storeys accessible from said elevators.

+ not to travel more than 2 storeys to access any storey that is on fire within the buildings.

- Fire service elevators shall be protected in separate elevator shafts (separate from other types of elevators) and no more than 3 fire service elevators shall be installed in a single elevator shaft. Structures covering elevator shafts must have fire-resistance ratings no lower than REI 120.

- Lobbies of fire service elevators which are vestibules must satisfy all following requirements:

...

+ no smaller than 6 m² when integrated with lobbies of smokeproof enclosures.

+ protected by class 1 fire-rated partitions.

+ installed with D65 landing valves for professional fire brigade.

- Installation of fire service elevators must take into account movement direction of professional fire brigade and ensure that the fire brigade can access any rooms on any storey of the buildings.

- Load capacity of fire service elevators must not be less than 630 kg in case of F1.3 apartment buildings and no less than 1 000 kg in case of manufacturing facilities and other public buildings.

- Travel speed of fire service elevator must not be less than H/60 (m/s) where H refers to lifted height (m).

- Structures covering fire service elevator cars must be made from non-flammable or mildly flammable materials.

6.14. In case of buildings with pitched roofs having the slope of up to 12 %, height up to valances or upper edges of outer walls exceeding 10 m and buildings with pitched roofs having the slope of more than 12 % and height up to valances exceeding 7 m, guardrails and handrails must be installed on the roofs satisfactory to applicable regulations and law. The guardrails and handrails must be installed in case of flat roofs, balconies, loggias, outdoor corridors, exposed staircases, stair treads and landings independent of fire service height of buildings.

6.15. Water supply system for firefighting must be sufficient to enable fire brigade and fire-fighting facilities to access and use at any time.

...

6.17. Fire control posts

a) Public residential buildings and constructions taller than 10 storeys; buildings with 2 or 3 basements; crowded public constructions (e.g. theaters, cinemas, bars and buildings with similar purposes with each storey occupied by more than 50 people according to Schedule G.9 under Annex G); garages for automobiles, motorcycles and bicycles, manufacturing facilities and warehouses larger than 18 000 m² must have fire control posts which must be regularly occupied by specialized employee.

b) Fire control posts must:

- Be large enough to install and equip devices according to fire protection requirements of the buildings but no larger than 6 m².

- Have 2 entrances/exits: one leads to empty spaces outside of the buildings and another leads to primary corridors for evacuation.

- Be separated with other building sections by class 1 fire prevention devices.

- Be installed with communication and contact devices of fire alarm systems which connect to every building section.

- Be installed with panels for monitoring and controlling fire suppression devices, smoke control devices and site plans dictating position of firefighting equipment of the buildings.

6.18. All basements in buildings with 2 to 3 basements must be equipped with two-way emergency communication devices between the fire control posts to:

...

- All rooms installed with devices that control smoke control systems.

- All fire service elevators.

- All areas of refuge.

- Ventilation system control rooms.

7. REGULATIONS ON MANAGEMENT

7.1. These Regulations prescribe technical requirements and management requirements that must be complied with in constructing new, renovating, or repairing buildings.

7.2. Transitional conditions

With respect to dossiers on construction design approved in terms of firefighting by regulatory agencies before the effective date hereof, continue to comply with the approved dossiers on construction design.

With respect to dossiers on construction design approved after the effective date hereof, comply with these Regulations;

...

8.1. All organizations and individuals that participate in affairs related to new construction, renovation, repair or change of building and construction functions including by not limited to preparing, appraising, approving, organizing implementation, managing and developing national and local technical standards and regulations related to buildings and constructions must comply with these Regulations.

8.2. Central and local regulatory agencies specialized in firefighting and constructions are responsible for inspecting compliance with these Regulations in preparing, appraising, approving and managing constructions of buildings and structures within their management as per the law.

8.3. Local regulatory agencies specialized in firefighting and constructions are responsible for cooperating in developing regulations related to specifications to design and implement driveways and parking lots for fire engines satisfactory to properties of local fire-fighting facilities.

8.4. Difficulties that arise during the implementation of these Regulations should be submitted to Department of Science Technology and Environment (Ministry of Construction).

9. ORGANIZATION FOR IMPLEMENTATION

9.1. Ministry of Construction is responsible for publicizing and guiding application of these Regulations for relevant entities.

9.2. If legislative documents, reference documents or guidelines mentioned under these Regulations are amended, supplemented or replaced, the new legislative documents, reference documents and guidelines will prevail./.

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Thuộc tính Văn bản pháp luật 02/2021/TT-BXD
Loại văn bản	Thông tư
Số hiệu	02/2021/TT-BXD
Cơ quan ban hành	Bộ Xây dựng
Người ký	Lê Quang Hùng
Ngày ban hành	19/05/2021
Ngày hiệu lực	...
Ngày công báo	...
Số công báo
Lĩnh vực	Xây dựng - Đô thị
Tình trạng hiệu lực	Không xác định
Cập nhật	năm ngoái
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Lược đồ Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions

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Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions
Loại văn bản	Thông tư
Số hiệu	02/2021/TT-BXD
Cơ quan ban hành	Bộ Xây dựng
Người ký	Lê Quang Hùng
Ngày ban hành	19/05/2021
Ngày hiệu lực	...
Ngày công báo	...
Số công báo
Lĩnh vực	Xây dựng - Đô thị
Tình trạng hiệu lực	Không xác định
Cập nhật	năm ngoái

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Văn bản liên quan Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions

Văn bản gốc Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions

Lịch sử hiệu lực Circular 02/2021/TT-BXD issuance of QCVN 06:2021/BXD Fire Safety Buldings and Constructions

19/05/2021

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