I am thinking about putting a Panasonic FV-05VF1 50 CFM Low Profile Ceiling
Mounted Fan in my bathroom. It is under a flat roof, with no outside wall
nearby. Can such a fan be vented through a flat roof without outside air
getting back in for the most of the time that it won't be on? With what
sort of roof top duct ending?
Thanks, Don <donwiss at panx.com>.