WhisperValue® DC is the lowest profile ENERGY STAR® rated ventilation fan available. Ideal for residential construction (Single; Multi-Family) and Manufactured Homes. It features Panasonic’s revolutionary ECM motor with SmartFlow™ optimum CFM technology, and incorporates a Pick-A-Flow® airflow selector switch to customize airflow (50, 80 or 100 CFM). KEY FEATURES Precision spot ventilation fan, ideal for residential construction (single and multifamily) and manufactured homes Revolutionary ECM motor with SmartFlow™ technology for optimum CFM output Pick-A-Flow® Airflow Selector – one fan, you choose the CFM (50, 80 or 100 CFM)