The choice is yours with the Delta Breez SIG110D dual speed exhaust fan. This quiet energy efficient exhaust fan features adjustable continuous low speed control and an adjustable delay timer. Air flow of 110 CFM with loudness rating at less than 0.3 sones at full speed. Features a DC brushless fan motor for extended reliability. Power consumption of 12.7 Watts with energy efficiency rating of 8.7 CFM per Watt. ENERGY STAR qualified and HVI certified.