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 & Multi-Family) and Manufactured Homes. It features Panasonic’s revolutionary DC motor with Smart Flow® optimum CFM technology and incorporates a Pick-A-Flow® speed selector switch to customize airflow (50-80-100 CFM).