What are the standard grades of fire doors? The smoke proof door has the effect of fire prevention. What are the grades of fire doors today? Application places of fire doors of different grades?

According to the time limit that can meet the requirements of fire resistance, heat insulation and fire resistance integrity at the same time within the specified time, fire doors can be divided into fire doors, class B fire doors and class C fire doors.

Requirements for fire resistance time limit of fire doors: according to the new national standard GB for fire doors implemented from January 1, 2009_ 12955-2008, the fire door is called a fire door if it passes the fire resistance test method and obtains the verification registration certificate and authorization mark issued by the Bureau of standards and inspection of the Ministry of economy. Not less than 1.5h, not less than 1.0h for class B and not less than 0.6h for class C.

The use scenes and places of fire doors of different grades are also different.

1、 Application place and scale of fire door:

(1) When the firewall must be provided with door and window openings, fireproof doors and windows shall be set;

(2) If the average weight of combustibles in the basement exceeds 30kg / m2, fire doors shall be selected;

(3) In the partition wall between the fire elevator shaft and machine room and the adjacent elevator shaft and machine room, when the door is opened on the partition wall, a fire door shall be set;

(4) The equipment room of the automatic rescue system set in the high-rise building, the door on the partition wall of the ventilation and air conditioning room shall be a fireproof door;

(5) If the distance between the doors on both sides of the firewall is not more than two meters, fire doors shall be set; Normally open fire doors shall be set at the fire compartment of scattered walkways.

2、 Application site and scale of class B fire door:

(1) When the staircase is closed for high-rise plants (warehouses), densely populated public buildings and densely populated multi-storey class C plants, the door leading to the staircase shall be class B fire door;

(2) Class B fire doors shall be selected for the doors leading to the front room and the staircase from the front room;

(3) When the staircases in the basement and semi basement must open the door on the partition wall, class B fire doors shall be selected;

(4) The door leading to the outdoor stairs should be class B fireproof door and should be open to the outside;

(5) Class B fire door shall be adopted for the door opening to the non closed staircase;

(6) The door opening to the front room shall be class B fire door. On the first floor of the staircase, the walkway and lobby can be included in the staircase to form an expanded closed staircase, but class B fire door and other methods shall be used to separate it from other walkways and rooms.

3、 Application place and scale of class C fire door:

The inspection door on the shaft wall shall be class C fireproof door. The front room of garbage hopper shall be equipped with Class C fire door.

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