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Bathroom exhaust fan.

9 years ago

I am putting in a second story bathroom and I am putting in a Panasonic inline fan in the attic . The problem I have is judging the size (cfm) . The bathroom is 100 sq. ft. but I want to duct it out to the side of the house and the run will be around 12 to 14 ft. So how will that calculate into the size or power of the fan ?

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Comment (1)

Bruce in Northern Virginia
9 years ago
The general estimate for requirements is that if you have an 8 foot ceiling the fan CFM should be about the same as the floor square footage, so you need about 100 CFM. The 110-120 CFM Panasonic is more than adequate air flow for that size bathroom (some of the cheap fans are only 60-70 CFM).

And 12-14 feet of ducting should not be a problem if you you use hard metal 4" duct for the entire run - not the cheap flexible plastic or shiny tape-looking ducting. The convoluted surface on flexible ducting reduces air flow significantly over a long run of pipe.

Bruce
wjdski thanked Bruce in Northern Virginia
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