On Thu, 23 Nov 2017 16:23:16 +0000, Chris J Dixon wrote:

Clive Arthur wrote:

I need a grille on an exterior wall for a 150mm cooker hood extractor.

The choice is louvred, gravity or cowled.

I had a draught problem with my ducted kitchen extractor fan,
which faces west, and fitted a cowl BM424W:

https://www.amazon.co.uk/12-White-Ai.../dp/B00PJ8FNBY

It seems, subjectively, to reduce the effects when high winds are
blowing against it.

Chris

I fitted one over the backdraught shutter on an extractor. The outlet is in
the SW wall, so I did it mainly to keep out the weather.
There's still some clattering, but a kitchen extractor probably has heavier
louvres and is lower down.
For fewer beer tokens:
https://www.toolstation.com/shop/Ele...ir+Cowl/p50375
Brown or white.
--
Peter.
The gods will stay away
whilst religions hold sway