Bathroom Fan Venting Into the Attic?

[Dave Haller]

I purchased a new exhaust fan for a bathroom that's never had one before. The guy I contacted to install it suggested ventilating into the attic, rather than externally, since the attic itself is already ventilated. Anyone have experience with this? He said it's a very common move, but I want to make sure it's not a shortcut that could lead to expensive problems (mold, etc.) down the road.

[Arlan Potter]

New home building codes require them to vent outside. On my house they vent to the attic. It doesn't matter to me because I can't get my daughters to use the vent fans anyway.

For a well vented attic, it doesn't matter.