Fire retardant to fire retardant control hardware accessories have a doorway
The importance of fire retardant in public buildings don't have to go into, so you know how to play a role of fire retardant agent is? Door is not only fire prevention agent, in fact, all kinds of door control hardware to cooperate, to use the fire retardant function to the limit.
Door closers
Through the hinge to fire retardant and frame together, it can be closed smoothly. But sometimes we may forget close the door, at this time of door closers will be needed. Door closers, just as its name implies, is to make the door shut down of the equipment. It is a hydraulic device, such as spring, door head can through compressed released after when the door is open, the door automatically closed, as the swing door, can ensure that the door was open, accurate, and the ?
