What is steel fire door and steel fire door grade

1.What is a steel fire door

Steel fire doors are made of steel materials for the door frame, door leaf frame and door leaf panel. If the door leaf is filled with materials, it is filled with non-toxic and harmless fire-proof and heat-insulating materials. It is also equipped with a fire-resistant door composed of fire-resistant hardware accessories.

2. Features of steel fire doors

Steel fire doors are doors made of fire-retardant materials with fire-resistance stability, integrity and heat insulation. They are mainly used for fire wall openings, stairwell entrances and exits, evacuation walkways, and pipeline wellheads in building fire compartments. Usually used for the passage of people, it can prevent the spread of flame and prevent the flow of combustion smoke in the event of a fire, and at the same time, it also plays a role of sealing.

3. Standard size of steel fire door

The steel fire door frame should be 1.2-1.5mm thick steel plate, the door leaf panel should be 0.8-1.2mm thick steel plate, and the reinforcement should be 1.2-1.5mm thick steel plate. If the reinforcement is provided with screw holes, the thickness of the steel plate should not be less than 3.0mm, the door leaf and door frame should be filled with non-combustible materials, and the melting temperature of the door lock, hinge, bolt and other hardware accessories should not be less than 950℃.

At present, national standards do not specify the size of fire doors, only the fire resistance performance of fire doors. Generally, the drawings of fire doors are marked with FM0615, FM0618, FM1018, FM1218, FM0921, FM1021, FM1221, FM1521, FM1821 FM2121 and so on. The largest is FM2421, etc. As long as the height does not exceed 2100mm, then these specifications and dimensions are standard.

4. Grade of steel fire door

Like other fire doors, steel fire doors are graded, and the grade of steel fire doors is also determined by its fire resistance time.

(1) Grade A steel fire door:

The fire resistance time of Class A steel fire door is not less than 1.5 hours. Only when this point is met can it be called Class A fire door. The interior of Class A fire door generally uses perlite, and a small amount of vermiculite fire board, Foam door core board, MC conforming material and other fireproof materials, the thickness of Class A fireproof door is generally 50mm.

(2) Grade B steel fire door:

The fire resistance time of Class B steel fire doors is not less than 1.0 hours, and the hardware fittings used on the fire doors must also be fireproof hardware fittings. Usually this kind of fire door is generally used for the entrance door of home improvement.

(3) Grade C steel fire door:

The fire resistance time of Class C steel fire doors is not less than 0.5 hours. The accessories used in Class C fire doors must be fireproofed and meet the specified fire resistance limit.

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