One other point is that, if the bathroom exhaust duct is a long run, then the exhaust fan may not be strong enough to push the damp air to the end of the duct. In that case, all of the moisture from the bathroom will stay in the duct and run to the low point. This problem could be worse when it rains because of the increase in humidity in the attic.
Last edited by retiredguy123; 03-31-2019 at 06:04 PM.
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