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Old 10-21-2008, 08:12 AM   #16
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excess moisture in bathroom with new vent

beenthere, i tested the exhaust with the door opened and closed and it didnt seem to make much of a difference. there is a narrow 1/3 inch gap on the bottom of the door that i can feel air being sucked through.

scottr, the crawlspace is not terribly cold. it was a bit cooler than the rest of the house but not freezing so i dont think insulation in there is an issue. thanks for that suggestion anyway.

hvaclover, the flex tube is not insulated and is not like the pic you attached. it is very thin aluminum. i am not sure what this flex duct is rated as. i think i threw away the packaging already but i can go back to home depot to find out what it is. should i be looking for "rated for bath fans" or something like that? finally, the flex duct was not pulled taut. i believe its supposed to stretch out to 12 feet but i only used about 10 of it (including the bends). is it really bad to have the last 2 feet un-stretched? i would prefer leaving this flex duct as is because modifying it would require ripping apart the soffit i just built above the shower. at this point, it would be easier to just replace the fan with a 150 CFM unit.

again, thanks for all the feedback.

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Old 10-21-2008, 11:33 AM   #17
An old Tradesmen
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excess moisture in bathroom with new vent

If your door is 36" wide. At a 1/3" gap, that would mean the air would be traveling at a velocity of 970 foot per minute.

Did you seal the cabinet yet. Your probably pulling some air from the open cavity.

Since you did feel some difference, if the fan is moving 80CFM with the door open. Closing the door is probably dropping you below 70CFM.
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Old 10-21-2008, 11:49 AM   #18
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excess moisture in bathroom with new vent

beenthere, i will seal it tonight and report back with results.

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