I recently had a bathroom constructed in my basement. When they
installed the bath fan they tied into the existing dryer vent line,
which I wasn't exactly thrilled about. They assured me it would be
fine. Sure enough, when I ran the dryer, the exhaust went right into
the bath fan. The contractor said he thought he had tied the bath fan
in far enough down the run that this would not happen. His solution
is to use some type of T with a baffle built in to prevent the
backflow. Is this really a good idea? Or should I tell him NO DICE !!