My dad was a dentist and thought it would be unseemly for patients to become aware of any emanations from his private bathroom. He had exhaust fans rigged up th

My dad was a dentist and thought it would be unseemly for patients to become aware of any emanations from his private bathroom. He had exhaust fans rigged up that he claimed could changeover the whole room in 2 minute. They were unnervingly loud but did the trick.