The Delta BreezGREEnBuilder GBR50 is the perfect combination of power, quality and performance in a bath fan, and at a value price. Air flow of 50 CFM with loudness rating of less than 0.3 sones. Features a DC brushless fan motor for superior reliability and efficiency, and extremely low power consumption. The fan operates using 3.8 Watts with an efficiency rating of 13.1 CFM per Watt. Easy to install; smaller size than most performance fans on the market. ENERGY STAR qualified and HVI certified.