The manufacturers of every bathroom exhaust fan I've seen, say they must be
exhausted to the outside. You can go through the roof, wall or even soffet,
and there are fittings for each application
"MP" wrote in message
...
I was wondering if someone could enlighten me. In all that I've read about
bathroom exhausts, most of the time it talks about using the soffit to
exhaust the vapour.

However, I talked to a friend and he said to avoid that, because it builds
moisture under the endge of the roof. I'd be better off with a roof vent.

Could someone please give me some feedback on this?

TIA