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Old 09-20-2011, 01:39 PM   #1
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Bathroom fan/ light


Hello, I am adding a fan/ light to my bathroom, the exhaust out of the fan is 4", my question is, does the exhaust have to be 4" pvc all the way out of the house or can it be reduced? If so, to what 3" or 2"? Thank you

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Old 09-21-2011, 11:15 AM   #2
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Bathroom fan/ light


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Hello, I am adding a fan/ light to my bathroom, the exhaust out of the fan is 4", my question is, does the exhaust have to be 4" pvc all the way out of the house or can it be reduced? If so, to what 3" or 2"? Thank you
It should stay 4". Why are you using PVC as opposed to an aluminum rigid duct?

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Old 09-21-2011, 05:33 PM   #3
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Bathroom fan/ light


Thank you, the reason I said pvc is because, I have extra and the fan base is plastic. I didn't research any other avenue. But I will look into the aluminum rigid duct. Thanks again.
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Old 09-22-2011, 10:43 PM   #4
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Bathroom fan/ light


Flexi-duct or alum-rigid are usually accepted per inspection.

PVC was not accepted per inspection for me - so I had to redo it. Might not be an issue where you're at but it was for me.

The reason why not to reduce is because these are designed to pump out through a 4" outlet - any build in air pressure (which can also result if you use a flex-hose that falls in and kinks up on itself) can bog down the fan's propulsion and even create water condensation (because it's venting steam) as well as overheat the motor. . .etc
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Old 09-22-2011, 11:04 PM   #5
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If you're running the ductwork through the attic or other cold areas, insulate the run.
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