The geniuses that built my house connected the exhaust fans in both of my bathrooms to the cold air return tubes in my attic space. Is it ok to do that? Does not seem right to me.
I would like to install new fans and when I do, would like to create a manifold with 4" duct and connect both fan's exhaust to a my drier vent stack going out the top of the roof. Does that sound lile an acceptable idea? Not sure if code will accept that.