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.

Components

• 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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