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

9100DN OWNER wrote:
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.

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

"9100DN OWNER" wrote in message
...
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
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.

Ian Middleton wrote:
"9100DN OWNER" wrote in message
...

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.


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 http://www.bes.ltd.uk

David