Broan® AE50110DC Flex DC™ Series Exhaust Bath Fan, ENERGY STAR® offers easy, room side installation, with .No Attic Access Required.. Ceiling mounted ventilation fan features foldable mounting ears and EZ Duct connector for easy installation. New duct damper technology provides a tighter seal, resulting in reduced warm and cold air backdrafts. This energy efficient fan operates at a selectable CFM range of 50-80-110 at a quiet operation of <0.3-0.4-0.9 sones. Features: FlexFlow™ technology, select between 50, 80 or 110 CFM; Quiet operation at <0.3-0.4-0.9 sones; Powerful ventilation reduces humidity to quickly eliminate fogged mirrors and manage moisture, so your vision will always be clear and your surroundings will always be comfortable; Retrofit installations can be done entirely from the room-side . no attic access required. This means a faster, easier installation, so you can move on to something else; Flex DC fans reduce air leakage by up to 50% compared to competitive models, resulting in better home performance via blower door tests and reducing cold and warm air backdrafts; Plug in, permanently lubricated, brushless DC motor . engineered for continuous operation; Can be installed in a wall if mounted 8-ft. or more above the floor; ENERGY STAR® certified product; Quiet, energy efficient exhaust fan to help control air quality; Selectable CFM For flexible installation; Easy to install new / replace existing product from the roomside - Includes: Non-metallic damper/duct connector