The steel fire door frame should be made of 1.2 ~ 1.5 mm thick steel plate, and the door leaf panel should be made of 0.8 ~ 1.2 mm thick steel plate. The reinforcement shall be 1.2 ~ 1.5 mm thick steel plate. If there are screw holes in the reinforcement, the thickness of the steel plate should be not less than 3.0mm, and incombustibility data should be filled in the door leaf and door frame. The melting temperature of hardware fittings such as door locks and latches shall not be lower than 950℃. Steel fire doors are door frames, door leaf frames and door leaf panels made of steel materials. If the door leaf is filled with materials, non-toxic and harmless fireproof and heat-insulating materials and equipped with fireproof hardware fittings, it has certain fire resistance. Classification: safety facilities to prevent the spread of underground or building fires and control airflow, usually divided into steel and wood fire doors. Class A fire doors, class B fire doors with a fire resistance limit of 1.5 hours, class C fire doors with a fire resistance limit of 1.0 hours, and fire doors with a fire resistance limit of 0.5 hours actually have many kinds, such as wood fire doors, glass fire doors, steel fire doors and so on.

According to the use function, there are access fire doors, entrance fire doors, indoor fire doors, explosion-proof fire doors, quick-lock fire doors, quick-open fire doors in case of fire, and multifunctional fire doors. According to technology: there are electronic fire doors, etc. According to the installation position of the door closer, there are external fire doors and internal fire doors; Thickness regulation: door leaf panel ≥ 0.8; Door frame plate ≥ 1.2 (Grade B and C) 1.5 (Grade A); Hinge plate ≥ 3.0; Reinforcement without screw holes ≥1.2; Threaded hole reinforcement ≥3.0. Requirements for air tightness of fire doors: The national standards have clear requirements on the gap size of each lap joint of fire doors: for steel fire doors, the lap joint between the fan and the door frame should not be less than 10mm, and the gap between the fan and the door frame should not be greater than 4 mm. ..

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