These shutters are usually of steel construction although multi-wall panelled aluminium is also available. The curtains can be made up to 10m wide and 7m drop.
Types and operation
- Steel shutters - laths are cold rolled from galvanised or colour PVC coated steel bands.
- Fire shutters - offering up to four hour fire protection with fire certificate. Produced from steel laths, construction meets with rigorous testing procedures. Auto-closure systems, activated by heat or fire alarm, with interface electronics.
- Manual - self coil with assistance of counterbalancing springs operated by a chain drive connected to the end of the roller.
- Electric - smaller shutters have integral tubular motors. Larger units require 3 phase direct drive motors with integral gearboxes, that connect on the end of the roller. Most systems allow manual chain drive override in case of power failure.
- Roller assembly - in steel, supported at either end by an end bearing brackets.
- Guide rail - in steel, to match the curtain.
- Bottom rail - steel section that can be fitted with a rubber tube to reduce draught and ingress of water. A pneumatic stop and safety edge contact sensor can be fitted.
- Wicket gate - a door that is cut into the shutter curtain and hinged to the side. Allows pedestrian access when the shutter is lowered.
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