John wrote:
"Donwill" popple @diddle .dot wrote in message
...
Sorry, the link in the first message is wrong, I left out the htm at the
end. The correct link is in the second message i.e.

http://www.continentalfan.com/ext.htm




Just a point when planning fans - if the fan will extract X cubic feet of
air per minute - then you need to make sure that this air is going to be
replaced from somewhere.
Fitting a fan in a sealed room just does next to nothing.


Its generally allowed for with a 'leaky door' or a grille in the door or
internal wall..if its well sealed.