On Tuesday, 28 January 2020 22:27:20 UTC, Jeff Layman wrote:
On 28/01/20 22:07, polygonum_on_google wrote:
In our kitchen we have a perfectly ordinary cooker hood vented outside. Trouble is, there is quite a draught from it. It exits into the gap between our house and our neighbours' - which can be pretty windy. Fine when cooking, but makes the whole kitchen a bit chilly in the winter.

Is there a simple (but effective) way of reducing airflow when we are not using it?

Obviously we could shove a rolled up newspaper in the hole - but that is hardly convenient!

You could try a cowl vent or flap vent as shown he
https://www.screwfix.com/c/heating-plumbing/air-vents/cat840496

Either can help, but aren't perfect. The cowl vent can let some air in
as it's still open to the outside. The flap vent is closed, but the one
I used would make a noise as wind rushed past it and pulled it open,
allowing it to fall back when the wind dropped, and make a tapping
noise. I had to fit a sort of restrictor so it could open only a cm.

I should have gone out and checked what is visible on the side! :-) Because of the arrangement of houses here, we virtually never even look up that side. (Not that it is a problem to do so!)

Will check in the morning.

Thank you.