I have a fan on the bathroom wall, venting via a small length of pipe to a flap type vent cover.
On windy days there is a draft coming through the vent cover via the fan.
Can this be reduced without stopping the fan being effective when it switches on . It is activated via a humidistat. The flaps on the cover are moving freely so not a problem with them being stuck open.
Eddie
Are you really sure your flaps are moving freely? They should stay closed unless air is blown at them from the inside so it's hard to see where the draft is coming from. On a day where you're experiencing a draft, have you tried looking outside at the flaps (with the fan off) to see what they are actually doing?
David
You can get flap valves (not too sure of their name) that go inline in the pipe and stop reverse flow, got mine from Jayhards, when Jayhards existed. Work quite well as my last house suffered air blowing in freezin the bathroom.
As it happens someone put me onto these recently in another thread about ducting: see item 15666 at
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