Hi: I am wondering if someone could help me to understand the best way to install an exhaust fan in a main floor bathroom. Our main floor bath is right in the center of the home. I feel we should go straight up, and through the roof with it.(home is a rambler with an attic, though I don't believe you could stand up in the attic all the way) It is the shortest distance, seems it would help the fan work as effectively as it can. My husband is adamant that we go up (into the attic) and over, out the side of the house with the exhaust "duct work", which is approximately 20 feet. We are not able to go directly out the side of the house where the bathroom is because of the pitch of the roof. I am not believing that an exhaust fan is capable of removing moisture, and successfully blowing it 20 feet sideways to get it outside. What would be the correct way to do this? Could anyone help me to understand? Thanks!