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Old 01-29-2016, 12:05 PM   #1
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Bathroom fan into attic


Is it okay to let the exhaust pipe from a bathroom fan to expel into an unused attic or does it have to go in a hole to the outside?
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Old 01-29-2016, 12:11 PM   #2
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Quote:
Originally Posted by Mikeron View Post
Is it okay to let the exhaust pipe from a bathroom fan to expel into an unused attic or does it have to go in a hole to the outside?
Ok as long as the attic air temperature is higher than the dew point temperature of the air being pumped into the attic. Most summer days is a possibility. Most winter days not so.
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Old 01-31-2016, 07:53 PM   #3
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I think you should vent it outside. It will create quite a bit of moisture in the attic.
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Old 01-31-2016, 07:55 PM   #4
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My understanding of code is that it needs to exhaust to the exterior, and any duct exposed in unconditioned space needs to be insulated.
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Old 01-31-2016, 08:00 PM   #5
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No way should it just vent into an attic!!!!
No exceptions!!!
Needs to be vented out the roof or out a side wall.
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