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Old 11-29-2009, 10:41 AM   #1
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Exhaust Fan drips water

My bathroom exhaust fan drips from condensation after 20 years.
My exhaust goes into the attic and lays on the insulation and then runs
up to a roof vent. The duct work is flexible dryer duct plastic. There was a
valley where it condensed. I got rid of the vally and now I ran the flex on
a 45 angle right to theroof vent. The exhaust fan has a light and when I turn
the light on the heat goes up the exhaust fan and condenses. When it drips
it falls right into the middle of the toilet below. That worked out well until you
sit down on the toilet and get water drip running down you lower back!
Any thoughts or suggestion greatly appreciated????


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Old 11-29-2009, 11:38 PM   #2
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You might want to get some insulated flex duct, The warm air from the bath is hitting the cold air in the attic and creating moisture,


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Old 11-30-2009, 06:20 AM   #3
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Originally Posted by James Con View Post
You might want to get some insulated flex duct, .......
James nailed it

Tommy solved this same problem on a recent TV episode of Ask TOH by substituting the 4" plastic duct with 4" insulated duct.


& Stay Safe
.....Bob Lavery
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Old 11-30-2009, 08:18 AM   #4
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Flexible duct material has ridges which slow down the airflow. Since the duct is in the attic, there is probably a large temperature change also. This causes the air in the duct to have condensate. I would go to a ridgid duct and install insulation around it.
If you have never made a mistake, you haven't done much.
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