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Questions tagged [exhaust]

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4 votes
3 answers
3k views

How can I prevent cold air from dropping down my bath fan duct?

In my new home, on the second floor, the bathroom fans goes outside and under the roof, so the output is upside down. They installed the type of vent with a flap that, normally with gravity and ...
Benner's user avatar
  • 41
3 votes
4 answers
12k views

Will a 4", 100CFM bathroom exhaust fan work with 3" exhaust duct?

The bathroom is 112x80x96. The duct to outside will be 3-4' at the longest. This is a 100CFM 25W, 4" fan. The only reason why I want to buy this one is because it has humidity sensor and timer ...
MiniMe's user avatar
  • 3,422