Roger wrote:
The message
from John Rumm contains these words:

I have used this one in the past:

http://www.tlc-direct.co.uk/Products/BGREMHM.html

to control an inline ducted fan connected to the showerlight extraction
vent you linked to above.

Thanks John (and Jon).

So that is what happened. When I went back to collect the link I managed
to copy the wrong one. Mea very culpa.

With no other suggestions forthcoming it looks like I will be buying the
above item.

They are quite pricey. Once option would be to butcher the module from a
humidistat fan, but then these are not exactly cheap.

--
Cheers,

John.

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