Can anyone tell me if I can replace my upstairs bathroom duct vent with an electric in wall register style heater? I have an old house and the previous owners ran ductwork to the bathroom, but the air flow is very weak. And the bathroom is part of a bedroom and hoping that it would help heat it also, as there is no vents in the room. I was planning on putting in a wall heater anyway, but just thought of replacing the vent so that I do not have to tear into the wall. I appreciate any suggestions.