i got a clay air brick in our bathroom and want to add a extractor fan. Should I just mortar in a 100mm round pipe(flush with wall on the inside)? do I need to consider anything on the air brick outside? Maybe stop back flow wind and get outside grill?
That will probably work; I have something similar but it's at the end of a long duct.
Sometimes the fan includes the anti-backflow shutters, which would solve that problem.
I was planning on bonding the internal side . But realised the fan would need a fixing . I presume I can't fix into expanding foam. If I put bonding and filler on top of it can I fix into that? Or should I use strong mortar mix?
I'd put in a piece of wood, square with a round hole in it. Or conceivably plasterboard. Fix to surrounding wall (somehow) and fill space behind, around duct, with exp foam. Screw fan to wood.
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