https://groups.google.com/g/uk.d-i-y...m/U1hEJLqcAAAJ
is the thread,
very interesting, i might vent an old wooden floor up the chimney myself...
put lots of kingspan and foam and tape the joints as someone says so dont get draughts into the room..

[g]

On Thursday, September 3, 2020 at 8:56:17 AM UTC+1, Brian Gaff (Sofa) wrote:
Quote the post you are replying to, especially when its old, that protal is
crap.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

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Note this Signature is meaningless.!
"MSK" wrote in message
oupdirect.com...
Just read your post and I was thinking of doing the same thing. My floor
is insulated but I have poor subfloor ventilation. Rather than use fans I
thought I would use the redundant chimney to draw more air. How did this
work out for you ?

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