Class B fire doors have a minimum fire rating of 1 hours. General room and atrium corridor door figured using B fire door specifications for the "high regulation" 5.1.5.1, and figured out the hall and the atrium fire door specifications for the "high regulation" 5.1.5.2 and so on, are that B fire door specifications because of the building environment is different.

B fire doors are popular in the market, B fire board features: General B fire door is flexible, and durable, feel, touch will feel extremely smooth surface, beautiful appearance, easy to use.

Standard for Grade B fire doors

Class B fire door standard: Class B fire door, fire rating is not less than 1 hours. Class B fire door standards in the fireproof limit relative to the first class fire door standards decreased slightly, with reference to the installation site, fire codes, usually the first class fire door is installed on the firewall, or high-rise building door (in accordance with certain conditions, etc.). Class B fire door is usually installed in a closed stairwell, smoke proof staircase and antechamber etc..

Specification for Grade B fire doors

Class B fire door specifications: in addition to the national building doors and windows, holes unified modular system requirements of the door hole size (GBJ2 - 73< building unified modular system), but also according to user requirements and order. Different buildings, grade B fire doors will also be different specifications.

1, when the high-rise building, the atrium area is greater than the fire partition: the atrium and corridors are the same room doors and windows, B fire doors should have the function of automatic closing, and B fire doors specifications for the "high regulation" provisions of article 5.1.5.1. With the passage through the atrium, B fire doors should be set for the specification of the hall "high regulation" provisions of article 5.1.5.2.

2, when the firewall on both sides of the doors and windows of less than 2 meters, the angle is less than 4 meters, B fire door specifications for the "high regulation" 5.2.2.

3, high-rise buildings in the song and dance entertainment, entertainment venues need to open the door in the first layer and the two or three layer and the other on the wall, and shall not be lower than the grade B fire doors, fire doors at B specifications for the "high regulation" or the provisions of article 4.1.5 of the provisions of article 5.1.15.

4, smoke staircase staircase to the staircase between the door should use B fire door specifications for "high standard" 6.1.3 provisions.

5, basement and semi basement, staircase, in the first floor should be fire-resistant limit of not less than 2 hours of partition wall, the wall of the second class fire door specifications for "high standard" 6.2.8 provisions. "Anti regulation" article 7.4.4 provides that the "civil air defense regulations" 5.2.2 provisions.