Construction and operating principle of window curtains

Construction of window curtains is the same as in the case of gate curtains.

They consist of:

coat of curtain
shaft
guides
bottom bar
drive

Operating principle

Coat of the curtain is wound on the shaft and maintained in open position by the brake, whichin the case of fire, is released and the curtain closing fire zone. Developing of curtain can be by gravity or by mechanical drive powered by independent batteries.