1. The raw materials of grade a fire door are divided into steel and wood, so it is divided into steel fire door and wooden fireproof door.
2. The fire resistance time of Class A fire prevention back door is not less than 1.5 hours, only the fire door satisfying this condition can be called class a fire door.
3. Perlite is usually used for filling materials in Class A fire doors. Answer
4. The thickness of Class A fire door is usually 50mm.
Grade a fire door thickness: the thickness of steel grade a fire door frame is 120mm, and the steel plate used in production is 1.2mm, 1.5mm and 3.0mm respectively according to different positions of national standards, and the thickness of door leaf is 50mm, the minimum thickness of steel plate is 0.8mm. The thickness of wooden grade a fire door frame is 100mm, and the thickness of door leaf is 50-55mm. The fire resistance time of Class A fire door is 1.5 hours.
Class A fire door type Division: according to the width of door body, it is divided into single fire door (open), double fire door (open), double fire door including sub-mother fire door. According to the height of door body, it can be divided into fire doors with bright windows and fire doors without bright windows. According to whether the door leaf is inlaid with fire glass, it can be divided into fire doors with clear View window and non-viewing windows. Class A fire-proof glass must be used for glazing and viewing windows.
Class A knows that fire doors are the highest grade fire doors. Class A fire door size within 2100*2300 can be done, fire door is an important part of fire fighting equipment, divided into Class A, Class B, class C, is an important part of social fire prevention, therefore, the quality and use of fire doors are the key to the success or failure of fire prevention. According to the code for fire protection design of buildings, fire doors must be Class A, Class B and Class C, and the minimum fire resistance limit is specified, namely Class A 1.20h, Class B 0.90h and Class C 0.60h.
Its fire resistance and heat insulation, fire resistance integrity is greater than or equal to 1.50H fire door is Class A fire door.
Fire door is one of the measures for building fire separation. It is usually used on the firewall, the entrance and exit of the staircase or the opening of the pipe well. It is required to be able to isolate smoke and fire. Fire doors play an important role in preventing the spread and spread of smoke and fire and reducing losses. Therefore, strict requirements must be imposed on them. According to the code for building design fire protection, fire doors are defined as Class A, Class B and Class C, and the minimum fire resistance limit is specified, namely Class A 1.20h, Class B 0.90h and Class C 0.60h.
Fire doors are divided into Class A, Class B and Class C, whose fire insulation and fire integrity are greater than or equal to the following values: Class A should be 1.50h; Class B should be 1.0h; Class C should be 0.5h. -- The provisions of Article 4.5.1.2 of the new fire door standard GB12955-2008.
