It's vented to a soffit outside. It's a type that doesn't have a flap, but more of a diffuser and slots for ventilation.
There is a flap on the fart fan, but the way it's set up/balanced, it's open maybe 5-10%. I've thought about glueing a penny on it to close it 100% just in case moisture was coming in from the exterior. I just don't see it making it through 10-20' of 3" duct.
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where is the fan vented to?
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