How do fire curtains work?

Fire curtains are composed of an aluminium fibre glass fire rated fabric, capable of resisting high temperatures, smoke and gases which is rolled onto a steel barrel and powered by a special internal tubular geared motor. With a heavy bottom bar attached to the curtain, the fire curtain will descend fully to the floor on command down steel side guides. When not required the unit can either be manually reset or automatically retract into its concealed position until activated again.