On 13/03/2021 14:43, Tim Lamb wrote:
In message , Steve Walker
writes
On 13/03/2021 09:31, Tim Lamb wrote:

Snip
On Fri, 12 Mar 2021 22:27:06 +0000, Steve Walker
wrote:


The cooker extract draws complaints so is first on the list for
action:-)
Â*Next question.. what about powered flaps? Do they exist as an
optionalÂ* fitting? Looping the fan supply to some sort of actuator
within theÂ* extractor housing might not invoke part P!

The term you need is "motorised damper".

Ah! Thanks. Don't quite fit the modest cost target:-(

I have seen mention of *thermally operated* which hinted at the wax
expansion/contraction model.
Nothing so far on a *Duck.. duck* search:-)

I'll look again tonight. Today is mix/pour the concrete and fit the
holding down bolts for a barn re-roof!



how about this?

https://www.cef.co.uk/catalogue/cate...to-shutter-fan


--
The lifetime of any political organisation is about three years before
its been subverted by the people it tried to warn you about.

Anon.