There must be a seam plate with a cover between the double doors of the steel fire door, and the door closer and sequencer must be equipped. The steel fireproof door is embedded in the groove by the sealing strip made of incombustible material.

steel door frame,steel door price,steel doors and windows,emergency door bus,metal front door,fire rated door frame installation,

exit door width factor,metal door open sound effect,fire rated door frame installation,emergency door alarm,fire door closer,steel door frame,fire resistant door seals,

emergency door bus,emergency door break glass,lif fireproof security door,fire rated door frame installation,metal door hinge,steel door frame