MegaSack DRAW - This year's winner is user - rgwb
We will be in touch
We had kitchen redone recently. Extractor fan is fitted with a cheapo loose flap type cover outside. Does a fine job, but that end of the house catches all the wind and the flaps rattle annoyingly and it's very noticeable.
Ideally a cover which releases/opens only when the fans running would be perfect. Some sort of Electro-magnetic latch gizmo? Do they exist? Google ([i]other search engines are available[/i]) has not helped.
Don't really want one of the fixed cowl type covers because of the wind/rain on that side of house.
I looked into this (same problem)
Cheap Plan A - http://search.wickes.co.uk/search#w=cowled%20wall%20outlet&asug=
on grounds of cheapness I'm going to give it a try, I'm thinking that it will stop direct wind push on the flaps and hopefully slow down/reduce the amount of blow
I made a little box that went over the top of ours - maybe 5cm out from flaps and it was open to the bottom to stop the rattling.
what kind of ducting?
try an inline back draft valve
https://www.airflow.com/productdetail_/pg_BDF/51990601
The automatic shutter outlets are usually part of the fan itself.