First, the difference between Class A fire doors and Class B fire doors
1. Difference of fire resistance limit: Fire doors are one of the measures for building fire separation, which are usually used at the entrance and exit of stairwells or the opening of tube wells, requiring smoke prevention and fire prevention. Steel fire doors play an important role in preventing the spread of smoke and fire and reducing losses. Therefore, we must put forward strict requirements for them. Japan has strict regulations on fire doors, which are divided into Class A and Class B. The fire resistance limit of Class A fire doors is1.50 ~ 2.00 h; Class b fire doors are 0.50 ~1.50 h. According to the actual situation in China, fire doors are divided into three grades: A, B and C, indicating the fire integrity of fire doors, that is, the fire resistance time. At present, the standard in China is that the fire prevention time of Grade A is not less than 1.5 hours, Grade B is not less than 1.0 hours, and Grade C is not less than 0.6 hours.
2. The difference of materials used: the fire door has a simple structure, which is mainly composed of four parts: door closer, door panel material, door frame material and fire prevention board. Class A fire doors are generally made of 08 material with good quality, and their normal service life is 5-8 years. The iron material of the door panel is thick, and the weight of Class A fire door with the same thickness is greater than that of Class B fire door.
3. Difference of use position: Class A fire doors are generally used in more important places, such as private rooms and power distribution doors. General places such as corridors adopt Class B fire doors, and pipeline wells generally adopt Class C fire doors.
Second, the use of Class A fire doors
1. The equipment room, ventilation and air conditioning room of the automatic fire extinguishing system located in the high-rise building shall be separated from other parts by the partition wall with a fire resistance limit of not less than 2.00h, the floor of 1.50h and the Class A fire door.
2. The average weight of combustible materials stored in the basement is more than 30kg/㎡, and its fire resistance is not less than 2.00h, and the room door adopts Class A fire door.
3. The boiler room, power distribution room, diesel generator room (and other dangerous rooms) shall be provided with Class A fire doors, which can be automatically closed when the doors on the firewall must be opened.
4. 18 floors and below are equipped with evacuation stairs leading to the roof. The stairs between units are connected through the roof, and there is a firewall between units. The door is a Class-A fire-proof door, and the width of window wall and the height of sill wall are greater than 1.2m, so it is a unit residence without combustion wall. For more than 18 floors, each unit has an evacuation staircase leading to the roof, and the stairs of adjacent units above 18 floors are connected by balconies or corridors (the roofs may not be connected).
The materials of Class A fire doors are divided into steel and wood, so they are also divided into steel fire doors and wood fire doors. In fact, no matter what level of fire doors are made of steel, wood, steel and wood (see national standard). Mainly depends on what kind of customers want. The fire door is called Grade A not because of the material, but because of its fire-resistant time, which is not less than 1.5 hours. As long as this condition is met, it can be called Class A fire door. Generally, the filling material of Class A fire doors is perlite, and the difference is only the thickness. Some fireproof materials, such as foam door core board, vermiculite fireproof board and MC compliant material, are also used. The thickness of Class A fire doors is generally 50 mm ..
How much is a Class A fire door?
Is there a standard acceptance for the high price of steel and wood class A fire doors? 260 yuan/square meter, without 220 square meters? .
Class a fire door standard
The fire insulation and fire integrity of Class A fire doors are greater than or equal to1.50hh ... —— the provisions in Article 4.5. 1.2 of the new standard for fire doors (GB 12955-2008).
The above is the difference between Class A fire doors and Class B fire doors introduced by Bian Xiao. I hope I can help you. For more information about Class A fire doors, please continue to pay attention to Tuba Rabbit Decoration Network.