Back Draft Shutter

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Open - air pressure from the fan opens the flaps and allows air through the shutter. Closed - Once the fan is off, no air (or light) can pass back through the shutter. The spring o perated flaps close when there is no positive air movement, preventing any air back-flowing when fans are turned off. - Galvanised sheet steel housing - aluminium flaps When installed, the back draught shutters need to be positioned with the hinge area vertical, as shown in the image above. Show more