The shutter (1) is fire proof and mounted on rollers. The rollers are connected too a reversible motor (9), which moves the shutter up or down. The motors are fed by an emergency battery (21) and mains in parallel. The battery is recharging whilst the mains is switched on.When the shutter is not being moved, the current to the motors is switched off, and the shutter is held in position by a brake (12). The brake can be removed manually by a push button (30). Release of the brake allows current to pass and the motor to open or close the shutter. Fire detection is passed to a relay (18) and then operates the brake automatically. The base of the shutter has a sensor (27) to detect when an obstacle is reached and switch the motor off.
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