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Just realised that there is no ducting either!! The wall is only 6-8 inches thick but I think I should fit some ducting aswell as the back draft shutter and perhaps a cowl vent for a belt and braces approach.

thanks - will hopefully have a solution before winter sets in!

Thanks - looks an easy enough solution.

There are no shutters on the outside - all that is visible is a plastic grill, of and a view of the shower room!

I have recently had installed an extractor fan in a downstairs shower room. The problem appears to be the amount of cold air it is letting in when it is not operational. When you look though the fan you can see clearly outside - i.e. no shutters. Is this the norm for extractor fans? As a...