QuFresh ENERGY STAR® Slim Line Bath Fans are the ultimate in versatility for home and commercial use, offering odor ventilation, mildew prevention, and moisture reduction in a bathroom, laundry room, or utility space. Constructed using a low profile steel housing perfect for wall or ceiling mount installations and 4 in. oval duct connector with a spring-installled polymeric grille cover. This exhaust fan includes hanger bars and mounting tabs for installation against a joist or stud, and a motor with 3 speed selections (50, 80, or 100 CFM) with wiring knockouts on the housing. The SL100-3's ECM motor is highly efficient no matter which CFM setting you choose, and operates quietly from 0.6 - 1.2 sones. For added control, choose a Slim Line fan with an added humidity sensor (SL100-3H) or with both a humidity and motion sensor (SL100-3HM) to ensure your room is properly ventilated in any situation.