We have a split bath in our coach, the door for the toilet has a 2" gap at the top and bottom, the power vent is in with the toilet. We run the fan in there and never had any issues running it when we shower. Wintered in the coach and ran it every time we showered and never had any humidity problems.
2021 Ram Limited, 3500, Crew Cab, 1075FTPD of Torque!, Max Tow, Long bed, 4 x 4, Dually,
2006 40' Landmark Mt. Rushmore