Doors in commercial places and safety exit doors in residential corridors are generally required to install fire doors. There are also classification standards for fire doors used in different places. So what are the classification standards for fire doors? Fire protection What is the scope of use of door grades? Follow us to find out!

The classification standard for fire doors is divided into several levels

Class A fire doors

Generally, it is an all-steel door, and a glass observation window can be added. Class A fire doors can prevent the fire from expanding in the event of a fire;

Class B fire doors

All steel doors, which can be opened on the door A small glass window, the glass is made of laminated fireproof glass. The main purpose of Class B fire doors is to prevent the spread of fire through openings. Both wooden doors and steel fire doors can achieve the fire protection performance of Class B fire doors.

Class C fire door

It is an all-steel door, and any material can be manufactured within the scope of its fire resistance integrity requirements.

The difference between fire door grades A, B, C and D

1. Fire protection time

The fire protection time of Class A is not less than 1.5h, the fire protection time of Class B is not less than 1h, and the fire protection time of Class C is not less than 1h. Not less than 0.6h.

2. Door leaf thickness

The thickness of Class A fire doors is 55mm, the thickness of Class B fire doors is 50mm, and the thickness of Class C fire doors is 45mm.

3. Fireproof glass

The thickness of fireproof glass is also closely related to the grade of fireproof door. Usually the thickness of fireproof door is 35mm, and the thickness of Class C fireproof door is 25mm. .

4. Installation location

The installation locations are different. Class A and B fire doors are generally installed in exit fire escapes, while Class C are mainly used for fire wells, pipe wells, etc.

What is the scope of use of fire doors

(1) Windows and door and window openings must not be opened on the fire wall. If they need to be opened, a Class A fire resistance limit of not less than 1.2h should be set. Fire doors and windows;

(2) The rising doors of the fire elevator shaft, the machine room and the adjacent elevator room are all Class A fire doors;

(3) In the basement, When opening a hole in the "staircase of a room" on the ground floor, a Class A fire door with a fire resistance rating of 1.2h should be used;

(4) Fuel-filled high-voltage capacitors and multiple fuel-filled high-voltage capacitors in high-rise civil buildings or podiums should be used. Oil switch and other combustible oil-immersed power transformer boilers. When the partition wall must open, a Class A fire door should be installed;

(5) In high-rise civil buildings or podiums, the oil storage room of the diesel generator room should be separated from the generator by a fire wall; When the firewall must be opened, a Class A fire door that can close itself should be installed.

What are the classification standards for fire doors? What is the scope of use of fire doors? The above is the relevant content we have introduced, which you can use as a reference.