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In article ,
says...
Joseph Meehan wrote:
...
First make sure that it is vented out of your home and not terminating in
the attic or just ending over a eve vent in hopes it will go outside.
Venting into the attic is really bad.

Only if the attic is inside rather than outside. The line between the
two is the insulation layer. You want to vent to the outside of the
insulation which can be in the attic.

I've seen some nasty rot from taking that advice -- warm, moist air
vented underneath a roof makes for condensation in the attic space.
Yes, the attic space is ventilated and the condensation will
eventually evaporate, but in the mean time you have wet rafters and
wet roof sheathing. Do it right, have it vented outside the attic.

--
is Joshua Putnam
http://www.phred.org/~josh/
Updated Infrared Photography Gallery:
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