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Old 01-11-2010, 10:44 AM   #1
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Bathroom ventilation problem


I had a house built for me about 5 years ago. Unknown to me, the builder did not vent my bathroom fans properly...they vented into the attic. So, I began getting a mold issue in my attic.

To make a long story short, this was corrected and the vents were vented out of the eaves, however they used flexible duct and it wasnt insulated (rigid isnt that good of an option because of the amount of clearance and length of run to the eave (at least 15 feet). A good amount of water built up into the duct so I tried to drain the water which resulted in the flexible duct ripping. I have a number of questions. First, should I proceed with the same method if I can eliminate all low spots in the duct and insulate it? Secondly, my fan is only 50 CFM; is that too small of a fan to push air that distance?

Lastly, I noticed this morning some frost that built up on the eave of the west facing wall. It has been very cold here with a lot of snow. Is this ok or does that need remedied as well?

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Old 01-11-2010, 03:26 PM   #2
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Bathroom ventilation problem


Code requires min 75CFM if its an intermittent fan(not ran 24/7).

Use insulated flex duct.

Some frost/ice is ok at colder winter temps.

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Old 01-11-2010, 03:34 PM   #3
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Bathroom ventilation problem


Thanks for the info. Is this what you would use:

http://www.lowes.com/lowes/lkn?actio...T4W&lpage=none
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Old 01-11-2010, 03:50 PM   #4
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Bathroom ventilation problem


I would use the type with the silver foil face.
but you can use that.
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