The Delta BreezSlim SLM100 is a low noise ENERGY STAR qualified fan that is perfect for single home retrofits as well as large multifamily projects. UL listed for both ceiling and sidewall installation. Fits inside a 4" wall. Air flow of 100 CFM with loudness rating of 1.0 Sone. Features a DC brushless motor for extended reliability and low power consumption. 14.5 Watts with efficiency rating of 6.8 CFM per Watt. ENERGY STAR qualified and HVI certified.