This 110 CFM Bathroom Fan with Humidity Sensor allows you to select the CFM airflow speed that is optimum for your bathroom. One fan, three CFM airflow settings- 50-80-110 CFMs. Galvanized steel fan housing unit with black rust-resistant powder coat finishes and built-in backdraft damper. Patented quick-install brackets make installation easy for new construction and room-side retrofit. ETL is listed for wet application when used with a GFCI branch circuit wire, meets ASHRAE 62.2 national standards for achieving acceptable indoor air quality in typical residences, and is CA Title 24 compliant.