Bath exhaust fan condensation

Old 05-16-06, 07:50 AM
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Question Bath exhaust fan condensation

What does it mean if the exhaust from a bathroom fan is dripping lots of water? is the duct clogged? fan not powerful enough? what would the solution be? thanks!
Old 05-16-06, 04:42 PM
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Try running the fan for 20 - 30 minutes after a shower
Old 05-16-06, 05:32 PM
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Also make sure fan is exhausted to the outdoors and not into the attic. Also improper venting can cause condensation to form in vent and run back down and cause damage to surrounding building materials. Vent can be vented through soffit rather than through roof. Horizontal installation reduces the possibility of condensation running back down around the fan. Insulating the duct also reduces the formation of condensation within it. (Condensation forms when warm, moist air contacts cool surface.) If vent is through the roof, make sure it is not clogged.
Old 05-17-06, 06:34 AM
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If you have flex duct, there is a possibility the duct has some dips and is not perfectly straight. The dips allow for the build-up of condensation.

Remove the flex duct and replace with solid pipe.
Old 05-19-06, 09:08 AM
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One of the most common problems I see with bathroom exhaust fans is not providing sufficient airflow to replace the air being sucked out. If the fan works ok and the duct work is correct, try opening the bathroom door a couple of inches during a shower. If that helps investigate ways to improve airflow into the bathroom.

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