Product Description Set it and forget it. The Delta Breez SIG80MLED is a powerful yet super quiet bathroom fan/LED light/LED nightlight equipped with a motion sensor and adjustable delay timer for the ultimate in convenience and worry-free operation. Air flow of 80 CFM with loudness rating of less than 0.3 sones. Features a DC brushless motor for extended reliability. Power consumption of 8.9 Watts with an efficiency rating of 8.9 CFM per Watt. ENERGY STAR qualified and HVI certified. From the Manufacturer Low noise ceiling mount ventilating fan rated for continuous running. Fan has been awarded ENERGY STAR Most E cient in 2013. It is HVI, UL, and cUL certifed, and can be used to comply with ASHRAE 62.2 (local and whole building continuous and intermittent operation), CA Title 24, and CALGreen requirements. DC brushless motor engineered to run continuously. Green and amber LED indicator lights to show continuous low speed and full speed modes. When motion sensor is detected, fan runs at full speed (80 CFM), when user leaves, fan remains running at full speed until delay time has passed, fan runs continuously at a pre-set lower level (0, 40, 60 CFM). Correct duct size determines <.3 sones noise level. Please see installation instructions when determining duct size before making any openings. 4-inches is standard.