Anywhere you vent, you have to make sure that the vent pipe is not only
sealed against leaks of hot humid air into any other space, but also
that the vent duct is insulated so as not to heat up the attic.

Joseph Meehan wrote:

Paul Oman wrote:

Hello

Is it OK to vent a dryer vertically into an attic crawl
space instead of horizontally thru an exterior wall to the
outside? - paul


Generally I would say no. There may be some exceptions where that craw
space is vented a lot better than most and you live in a dry environment.
Otherwise, you are going to add moisture to an area you want to keep as dry
as possible. Vent to the outside. I might add that you would also be
depositing lint down there.