110 CFM, Effective ventilation to remove moisture and reduce the risk of mold or mildew in most full baths, 1.3 Sones for Quiet performance, enough sound to know your fan is on, 100-Watt maximum incandescent A19 type bulb or energy efficient equivalent bulb with maximum overall length of 4.4 in. or less (bulb not included), 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