WhisperValue® DC™ fan with pre-installed condensation sensor helps control bathroom condensation to prevent mold and mildew. It is the lowest profile ENERGY STAR® rated ventilation fan available. Ideal for residential construction (Single and Multi-Family) and manufactured Homes. It features Panasonic's revolutionary ECM motor with SmartFlow™ optimum CFM technology, and incorporates a Pick-A-Flow™ speed selector switch to customize airflow (50-80-100 cfm). Panasonic WhisperValue® DC™ Ventilation Fan, 50/70/80/100/110 cfm Flow Rate, 4 in Diameter Duct, 120 VAC, 0.08/0.13/0.18 A, 60 Hz Frequency, 4.5/8.5/12.4 W Power, 13 in Grille Length, 13 in Grille Width, 10-1/4 in Housing Length, 10-1/4 in Housing Width, 3-3/8 in Housing Height, Steel Housing Material, Ceiling Mounting, Domestic/Import: Import