80 CFM, Effective ventilation to remove moisture and reduce the risk of mold or mildew in most full baths, 0.7 Sones for Ultra quiet performance, you might not notice it's on, Sensaire(TM) humidity sensing technology, senses humidity up to 4X faster than the competition, Retrofit installations can be done entirely from the room-side, no attic access required. This means a faster, easier installation, EzDuct(TM) connector can be installed from the room side, with no attic access required