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The vent tube must....

Posted by Dodgeman on December 21st, 2001 10:35 PM
In reply to leaking bathroom exhaust fan by gh on December 21st, 2001 06:25 PM [Go to top of thread]

slope continuous upwards. If the tube has low spots in it, the water in the moist air will condense out and fill the tube. I once had the same problem in a house that used flex tubing to vent to the ridge vent. The flex tube had a sag in it. Straightening the tube solved the problem.
Also make sure the flapper valve on the outlet of the fan is working so when the fan is off, a minimum of air "leaks" up the tube.
Good Luck,

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