Application scenarios of Class A, B, and C fire doors

The types of fire doors	sort	position	Terms category	source
Class A fire door	1	Doors, windows, and openings should not be opened on firewalls. If necessary, Class A fire doors and windows that cannot be opened or can automatically close in the event of a fire should be installed.	Strong bar	Article 6.1.5 of the Construction Regulations
	2	Class A fire doors should be regularly opened in the fire zone	Strong bar	Article 6.4.10 of the Construction Regulations
	3	Fire partition wall with fire resistance limit of no less than 2.00h shall be set between the fire elevator shaft, machine room and adjacent elevator shaft and machine room, and the doors on the partition wall shall be Class A fire door	Strong bar	Article 7.3.6 of the Construction Regulations
	4	The doors in the ventilation, air conditioning room and transformer and distribution room shall be class A fire doors	Strong bar	Article 6.2.7 of the Construction Regulations
	5	For the fire pump room attached in the building, the partition wall with fire resistance limit of no less than 2.0h and the floor of 1.50h shall be separated from other parts. The evacuation door shall be straight to the safety exit, and the door open to the evacuation corridor shall be class A fire door.	Strong bar	Article 5.5.12.3 of Technical Specification for Fire Water Supply and Hydrant System
	6	The boiler room and transformer room arranged in the building: the boiler room, transformer room and other parts should be separated by fire resistance walls not less than 2.00h and 1.50h non-combustible floors. No openings should be opened on the partition wall and floor. When it is necessary to set doors and Windows on the partition wall, grade A fire doors and Windows should be used.	Strong bar	Article 5.4.12.3 of the Construction Code
	7	The boiler room arranged in the civil building: when the oil storage room is set in the boiler room, the total storage capacity shall not be greater than 1m3, and the fire protection wall with fire resistance limit of not less than 3.00h shall be separated from the boiler room; when it is necessary to set the fire protection wall, the Class A fire door shall be used.	Strong bar	Article 5.4.12.4 of the Construction Code
	8	Diesel generator arranged in civil buildings: fire partition wall with fire resistance limit of no less than 2.00h and non-combustible floor of 1.5h shall be separated from other parts, and the door shall be class A fire door	Strong bar	Article 5.4.13.3 of the Construction Code
	9	Diesel generator arranged in the civil building: when the oil storage room is set in the equipment room, the total storage capacity should not be greater than 1m3, and the oil storage room should be a fire resistance limit not less than 3.00h from the generator; when it is necessary to open the fire partition, Class A fire door should be set.	Strong bar	Article 5.4.13.4 of the Construction Code
	10	Shelter floor (room): A fire partition with fire resistance limit of 3.00h shall be separated from the refuge area between the pipe well and the equipment. The door between the pipe well and the equipment shall not be opened directly to the refuge area; if it is necessary directly to the refuge area, the distance from the entrance and exit of the refuge area shall not be less than 5m, and class A fire door shall be used.	Strong bar	Article 5.5.23.4 of the Construction Code
	11	The doors of fire compartments shall be Class A fire doors	General ordinance	Article 6.4.13.2 of the Construction Regulations
	12	Shelter corridor: fire partition to the entrance of the shelter corridor to set up smoke prevention front room…, open the door of the front room should use class A fire door	General ordinance	Article 6.4.14.5 of the Construction Code
	13	Atrium: the doors and Windows connected with the atrium should be class A fire doors and Windows that can be closed themselves in case of fire	Strong bar	Article 5.3.2.1 of the Construction Regulations
	14	Sinking square: the door of the smoke-proof stairwell connected with the sunken square shall adopt the class A fire door.	Strong bar	Article 5.3.5.4 of the Construction Code
	15	Underground garage and semi-basement garage connected with the residential basement: When the evacuation stairwell of the residential part cannot enter directly, connected walkways should be set between the evacuation stairs of the garage and the residential part. The corridor should be separated by fire partition wall, and the doors of the garage to the corridor should adopt class A fire doors.	General ordinance	Article 6.0.7 of the Fire Prevention Code for Design of garage, Garage and Parking garage
	16	theatres, cinemas and halls located in other civil buildings: fire partition walls with fire resistance limit of no less than 2.00h shall be separated from other areas.	General ordinance	Article 5.4.7.1 of the Construction Code
	17	Substation in the civil building: when located in the high-rise main building or podium room, the door leading to other adjacent rooms shall be a class A fire door.	General ordinance	Article 6.1.3.1 of Code for Design of 20kV and below
	18	Substation in civil buildings: when located on the second floor or higher level of a multi-storey building, the doors leading to other adjacent rooms shall be Class A fire doors.	General ordinance	Article 6.1.3.2 of the Code for Design of 20kV and below Substation
	19	When the substation is located at the underground level or on the line surface, the doors leading to other adjacent rooms or corridors shall be Class A fire doors.	General ordinance	Article 6.1.3.4 of Code for Design of 20kV and below
	20	Doors with flammable items or leading to the car garage near the substation shall be Class A fire doors.	General ordinance	Article 6.1.3.5 of Code for Design of 20kV and below
	21	Class A fire doors or fire separated water curtain should be set at the openings leading to the stage area.	Strong bar	Article 8.1.4 of the Code for Design of Theater Architecture (JGJ 57-2016)
	22	When the high and low voltage distribution room is connected with the main stage, side stage and back stage, the front room with an area of no less than 6m2 must be set up, and the high and low voltage distribution rooms should be equipped with class A fire doors.	Strong bar	Article 8.1.7 of the Code for Design of Theater Architecture (JGJ 57-2016)
	23	It is strictly prohibited to set up the gas equipment on the stage. When gas equipment is used in the background, the partition wall with a fire resistance limit of no less than 3.0h should be separated from the class A fire door, and should not be close to the clothing room and prop room.	Strong bar	Article 8.1.13 of the Code for Design of Theater Architecture (JGJ 57-2016)
	24	When the theater building is built with or adjacent to other buildings, a separate fire partition should be formed, and the firewall shall be used, and the firewall shall not open window holes; when doors are set, Class A fire door should be used. The fire resistance limit of upper and lower floor in fire partition shall not be lower than 1.5h.	Strong bar	Article 8.1.14 of the Code for Design of Theater Architecture (JGJ 57-2016)
	25	The fire resistance limit of the partition wall of confidential rooms, archives and important warehouses should not be less than 2h, the floor should not be less than 1.5h, and class A fire doors should be used.	General ordinance	Article 5.0.5 of the Code for Design of Office Buildings (JGJ 67-2006)
	26	Firewall and Class A fire doors should be separated between the basic library, special library, dense library and other adjacent parts.	Strong bar	Article 6.2.1 of the Code for Design of Library Architecture (JGJ 38-2015)
	27	The buffer room of the archive area and the door of the archive should be opened in the direction of evacuation, and should be class A fire doors.	General ordinance	Article 6.0.9 of the Code for Architectural Design of Archives (JGJ 25-2010)
	28	Doors, Windows and openings should not be opened on the firewall or fire partition wall. When it must be opened, grade A fire doors, Windows or fire shutter with a fire resistance limit of not less than 3.00h should be set up.	General ordinance	Article 5.2.6 of Code for Fire Prevention Design of garage, Garage and Parking lot (GB50067-2014)
	29	Except for open garage and inclined floor garage, firewall shall be separated from the parking area and the ramp shall be separated by water curtain, fire shutter or Class A fire door and the parking area; however, when automatic fire extinguishing system is set on the garage and car ramp, water curtain, fire shutter or Class A fire door shall not be provided on the entrance and exit of the ramp.	General ordinance	Article 5.3.3 of the Code for Fire Protection Design of garage, Garage and Parking lot (GB50067-2014)
	30	The evacuation door of the audience hall shall be class A fire door and shall be opened in the evacuation direction.	General ordinance	Article 6.2.3 of the Code for Architectural Design of Cinema (JGJ 58-2008)
Class B fire door	1	Fire partition wall with fire resistance limit of no less than 2.00h shall be used between the adjacent nursing units of the hospital and nursing home, and the doors on the partition wall shall be class B fire doors	General ordinance	Article 5.4.5 of the Construction Code
	2	Dance hall, video hall, nightclub, kara OK hall (including has the function of kara ok restaurant), entertainment hall (including electronic entertainment hall), sauna (excluding bath part), Internet cafes and other entertainment entertainment venues (excluding theater, cinema): set in the hall, the wall door and the place and other parts of the building in the door shall be adopted class b fire door	Strong bar	Article 5.4.9.6 of the Construction Code
	3	For the elevator directly through the building, the elevator elevator hall shall be installed in the garage part, and the fire partition wall with a fire resistance limit of no less than 2.00h shall be separated from the garage	General ordinance	Article 5.5.6 of the Construction Regulations
	4	Setting of the safety exit of residential buildings: for residential buildings whose building height is greater than 27m, but not more than 54m, when an evacuation staircase is set in each unit, the evacuation staircase shall pass to the roof, and the evacuation staircase between the units shall be connected through the roof, and the door shall adopt class B fire door.	Strong bar	Article 5.5.26 of the Construction Code
	5	Setting of evacuation stairs for residential buildings: open stairwell shall be used for residential buildings with building height not greater than 21m; evacuation stairs adjacent to elevator shaft shall be closed stairwell. When Class B fire doors are used, open stairwell shall still be used.	General ordinance	Article 5.5.27.1 of the Construction Code
	6	Residential buildings with building height greater than 21m and not greater than 33m shall adopt closed stairwell; when the door shall adopt Class B fire door, open stairwell may be adopted.	General ordinance	Article 5.5.27.2 of the Construction Code
	7	Residential buildings with a building height greater than 33m should adopt smoke-proof stairwell……. Each floor to the same front room should not be greater than 3 doors and should use class B fire door.	General ordinance	Article 5.5.27.3 of the Construction Code
	8	For residential buildings with a height of greater than 54m, each household shall have a room compound with the following provisions: 2…, the door of the room shall be a Class B fire door	General ordinance	Article 5.5.32.2 of the Construction Regulations
	9	When the exterior wall of the building is a non-combustible wall, the firewall is not protruding from the outer surface of the wall, and the horizontal distance of the nearest edge between the doors, Windows and openings on both sides of the firewall should not be less than 2m for the measures to prevent fire spread.	General ordinance	Article 6.1.3 of the Construction Regulations
	10	The partition wall between the upper part of the stage and the stuffy top of the audience hall can be a fire partition wall with a fire resistance limit of not less than 1.5h, and the door on the partition wall should be class B fire door	General ordinance	Article 6.2.1 of the Construction Regulations
	11	Medical building operating room or surgical department, delivery room, intensive care unit, valuable precision medical equipment room, storage, laboratory, film room, etc., attached in the building nursery, kindergarten children and childrens playground children, elderly care facilities, should use fire resistance limit of not less than 2.00h and 1.00h floor separated from other places or parts, doors and Windows must be set on the wall should be class b fire doors and Windows.	Strong bar	Article 6.2.2 of the Construction Regulations
	12	Auxiliary warehouses of civil buildings and auxiliary rooms in backstage of theater; public kitchens in dormitory and apartment buildings and kitchen in other buildings; motor garage in residential buildings, fire partition with fire resistance limit of not less than 2.00h shall be separated from other parts. Door and Windows on the wall shall adopt Class B fire doors and Windows. When there are difficulties, fire shutter may be used.	General ordinance	Article 6.2.3 of the Construction Regulations
	13	Fire control room and other equipment room open to the building door shall use class B fire doors	Strong bar	Article 6.2.7 of the Construction Regulations
	14	For high-rise buildings, densely populated public buildings, densely populated multi-storey Class C workshops, Class A and Class B workshops, the doors of the closed stairwell shall be Class B fire doors, and shall be opened in the direction of evacuation.	Strong bar	Article 6.4.2.3 of the Construction Regulations
	15	Closed stairwell: the first floor of the stairwell can include an expanded walkway and hallways in the stairwell, but class B fire doors should be separated from other walkways and rooms.	Strong bar	Article 6.4.2.4 of the Construction Code
	16	Smoke proof stairwell: the door to the evacuation corridor and the front room to the stairwell shall be class B fire door.	Strong bar	Article 6.4.3.4 of the Construction Code
	17	Smoke proof stairwell: the first floor of the stairwell can include the walkway and the enlarged front room in the front room of the stairwell, but class B fire doors should be separated from other walkways and rooms.	Strong bar	Article 6.4.3.6 of the Construction Regulations
	18	In addition to the self-use stairs in the residential building set, the evacuation stairwell of underground or semi-underground buildings (rooms): the fire partition wall with fire resistance limit of no less than 2.00h should be adopted on the first floor and separated directly from the outdoor. When it is necessary to open the door on the partition wall, class B fire door should be adopted.	Strong bar	Article 6.4.4.2 of the Construction Code
	19	In addition to the residential building set within the stairs, underground or underground buildings (room) evacuation stair: building underground or half underground part and the ground part should not share the stair, it is necessary to share the stair, should be in the first layer of fire resistance limit is not less than 2.00h fire partition and class B fire door will underground or half underground and ground part of the connected parts completely separated.	Strong bar	Article 6.4.4.3 of the Construction Code
	20	Outdoor evacuation staircase: the door leading to the outdoor staircase shall be Class B fire door and shall be opened outward.	Strong bar	Article 6.4.5.4 of the Construction Code
	21	Shelter corridor: fire partition to the entrance of the shelter corridor should be set up smoke prevention room, the front room to the shelter corridor door should use class B fire door.	General ordinance	Article 6.4.14.5 of the Construction Code
	22	Front room of fire elevator: the door of the front room or the combined front room shall use class B fire door.	Strong bar	Article 7.3.5.4 of the Construction Code
	23	Substation in the civil building: when located in the high-rise main building or podium, the door leading to the corridor should be class B fire door.	General ordinance	Article 6.1.3.1 of Code for Design of 20kV and below
	24	Substation in a civil building: when located on the second floor or higher level of a multi-storey building, the door leading to the corridor should be a class B fire door.	General ordinance	Article 6.1.3.2 of the Code for Design of 20kV and below Substation
	25	Substation in civil buildings: when located in a single-storey building or on the first floor of a multi-storey building, the doors leading to other adjacent rooms or aisles shall be Class B fire doors.	General ordinance	Article 6.1.3.3 of the Code for Design of 20kV and below Substation
	26	Sports building: Class B fire doors shall be installed at the safety exit of the spectator hall, class competition hall or training hall.	General ordinance	Article 8.1.3.2 of the Code for Design of Sports Buildings (JGJ 31-2003)
	27	Except for the elevator, the well wall of the lifting equipment inside the library shall be a non-burning body with a fire resistance limit not less than 2.00h, and the transfer hole on the well wall shall be equipped with a fire gate not less than Class B.	General ordinance	Article 6.2.6 of the Code for the Design of Library Buildings (JGJ 38-2015)
	28	When the public kitchen in the dormitory has open fire heating device, it should be set by the external wall, and the wall and class B fire door with a fire resistance limit of not less than 2.0h should be separated from other parts.	General ordinance	Article 5.1.4 of the Code for Design of Dormitory Buildings (JGJ 36-2016)
	29	When setting the stairs in the reservoir area, the closed stairwell should be used, and the door should be the fireproof door not lower than class B.	General ordinance	Article 6.0.10 of the Code for Architectural Design of Archives (JGJ 25-2010)
	30	Firewall should not be located in the inner corner of the garage, repair garage. When located at the corner, the horizontal distance between the doors, Windows and openings on both sides of the wall at the inner corner shall not be less than 4m. The horizontal distance of the nearest edge between the doors, Windows and openings on both sides of the firewall shall not be less than 2m. When fixed class B fire Windows are set on both sides of the firewall, it is not limited by distance.	General ordinance	Article 5.2.4 of the Code for Fire Protection Design of garage, Garage and Parking lot (GB50067-2014)
	31	The pipe well of the mechanical pressurized air supply system shall be separated by the partition wall with a fire resistance limit of not less than 1.00h and the adjacent parts. When access doors must be set on the wall, Class B fire doors shall be used.	General ordinance	Article 3.3.9 of the Technical Standard for Building Smoke Prevention and Drainage System (GB 51251-2017)
Class C fire door	1	Vertical well, such as cable well, pipe well, exhaust well, exhaust channel, etc.: the fire resistance limit of the well wall is not less than 1.00h, and the inspection door on the well wall should adopt class C fire door.	Strong bar	Article 6.2.9.2 of the Construction Code
	2	Substation in civil building: the door directly to the outdoor shall be class C fire door.	General ordinance	Article 6.1.3.6 of Code for Design of 20kV and below
	3	Cable Wells and pipe Wells shall be separated by non-combustible materials or fire blocking material at each floor, and the fire resistance limit after separation shall not be lower than the fire resistance limit of the floor, and the inspection door on the well wall shall be Class C fire door.	Strong bar	4

Areas Requiring Class B Fire Doors and Installation Guidelines

At Guangdun Door Industry Co., Ltd., a leading fire door manufacturer in China, we understand the importance of choosing the correct fire doors to meet regulatory standards and ensure safety in various types of buildings. Below, we detail the areas that require Class B fire doors and the specific requirements for their installation.

Office and Rest Areas in Class C Factories

When offices or rest areas are located within Class C factories, it is crucial to use fire-resistant walls with a fire resistance rating of no less than 2.5 hours. These areas should also be separated from other sections by 1.0-hour fire-resistant floors. At least one independent safety exit must be provided. If the wall contains a connecting door, a Class B fire door must be installed to ensure adequate fire protection.

Warehouse Exits and Fire Zones

Each warehouse must have no fewer than two safety exits. However, if the warehouse covers less than 300 square meters, one exit is permitted. Class B fire doors must be installed in all exits leading to evacuation corridors, stairways, or outdoor areas, ensuring compliance with fire safety standards.

Lifting Equipment and Vertical Transport

In warehouses, vertical transport systems such as lifts should be located outside the building. If installation within the warehouse is unavoidable, the shaft must be protected by a structure with a fire resistance rating of no less than 2.0 hours, and Class B fire doors or fire shutters should be installed at the entrances.

Commercial Facilities Along Covered Pedestrian Streets

When commercial facilities such as restaurants or shops are connected via covered pedestrian streets, special attention should be paid to fire safety. The buildings along the pedestrian street must meet the following criteria:

1. The fire resistance rating of the buildings should be at least Level 2.
2. Class B fire doors or windows must be used for openings facing the pedestrian street. If fire-resistant glass is used, it should maintain both integrity and insulation for at least 1.0 hours.

Hospitals and Nursing Homes

In healthcare facilities like hospitals and nursing homes, the inpatient sections should not be located underground or semi-underground. When using Class 3 fire resistance buildings, the patient wards should not exceed two stories in height. For the separation of nursing units within hospitals, fire-resistant walls with a minimum rating of 2.0 hours should be used, and the doors in these walls must be Class B fire doors. Additionally, fire doors in corridors should be of the self-closing type.

Entertainment Venues

Entertainment venues such as karaoke bars, dance halls, and nightclubs must adhere to strict fire safety regulations. These establishments should not be located on floors lower than two levels below ground, and where they are positioned within a building, doors connecting to other areas must be Class B fire doors. If these venues are located underground or on the fourth floor or higher, each room’s floor area should not exceed 200 square meters.

Elevator Lobbies in Attached Parking Garages

For buildings with attached parking garages, Class B fire doors should be installed in the elevator lobbies to separate them from the garage areas. The fire resistance rating of the walls in these lobbies should not be less than 2.0 hours.

Residential Buildings

For residential buildings exceeding 27 meters in height but no more than 54 meters, it is necessary to install Class B fire doors at the main evacuation stairways. Additionally, unit doors should use Class B fire doors to ensure that escape routes are sufficiently protected.

Theater Stages and Audience Areas

In theaters, a fire-resistant wall with a rating of at least 3.0 hours should separate the stage from the audience seating area. Doors within these walls must be Class B fire doors to maintain proper fire safety.

Ventilation and HVAC Rooms

For ventilation and air conditioning machine rooms located within Class D or E factory buildings, the doors should be Class B fire doors, and the walls separating these rooms from other sections of the building must have a fire resistance rating of no less than 1.0 hours.

These requirements, based on fire door regulations and building safety codes, ensure the safety of various types of buildings, from commercial spaces to residential properties. At Guangdun Door Industry, we provide high-quality, certified fire doors that meet the stringent requirements of Class B fire doors, ensuring your building’s safety and compliance.

If you’re looking for a reliable fire door factory with extensive experience in manufacturing fire doors, contact us today to discuss your project and safety needs.