Fire doors refer to doors that are composed of door frames, door leaf frames and door leaf panels, filling materials, and fireproof hardware accessories, and can meet the requirements of fire resistance stability, integrity and thermal insulation for a certain period of time.

According to the material, there are mainly steel fire doors, wooden fire doors, and steel-wood fire doors, which are competitive in cost and have good fireproof performance, and are widely used in buildings. 

(The doors of equipment rooms must be fire doors such as transformer substation, fire pump room, elevator room, generator room, oil storage room, fire control room, fire extinguishing equipment room, ventilation space conditioning room, etc. It should be noted that equipment rooms located in civil air defense areas must be equipped with Class A fire doors; vertical shafts such as cable wells, pipe wells, smoke exhaust ducts, exhaust ducts, garbage ducts, etc. must be equipped with Class B or Class C fire doors.)

The inner core of the fire door is filled with perlite fireproof board, which is non-toxic, has good insulation performance and simple process compared to other door core materials; the fireproof expansion sealing strip is installed on the grooves around the door frame and door leaf. Its function is to expand rapidly when exposed to heat in the event of a fire to seal the gap on the door to prevent smoke from passing through.