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Reply by Lifesaver2000

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Posted on Ideas for venting

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Lifesaver2000

512 posts in 1750 days


#1 posted 12-30-2012 07:01 PM

I did a quick search on Amazon for bathroom vent fans, and the largest I saw was rated at 400 cfm. Let’s say your basement is 20’ x 20’ with an 8’ ceiling. This means that optimally this fan would change the air out once every eight minutes. With the length of the piping you want to run I would expect the actual cfm to be quite a bit less. I might be wrong but that doesn’t seem like enough air flow.

A couple of other things. You said that opening the window when it was 12 deg out was not an option, but if you have an exhaust fan blowing to outside there has to be air coming in from somewhere. If your house is very well sealed, it might even be necessary to crack the window a bit to allow make up air.

There are also a few safety concerns. One is the possibility that some of the finishes you want to use might be flammable and won’t mix well with the open motor design in some bathroom vent fans.


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