Broan ZB110 30 CFM to 110 CFM <0.3 Sones Energy Star Fan

UltraGreen energy saving DC motor: Efficiency well beyond Energy Star requirements, multi-speed capability ideal for meeting Ashrae 62.2,LEED and Energy Star for homes as well as local/spot ventilation needs; UltraSilent sound technology: HVI certified best-achievable lesser than 0.3 sone level provides nearly silent operation for a relaxing environment, state-of-the-art blower and duct outlet design smoothes airflow, high tech DC motor designed for nearly silent operation; UltraSmart control technology: Powerful operation maintained over a wide range of real-world installations ( CFM ratings maintained through at least 0.25 IN SP), Infinitely adjustable low cfm setting allows precise adjustment to prevent over-ventilating and maximize efficiency, adjustable time delay sets how long fan will run on high speed before returning to a continuous lower speed; UltraQuick installation technology: Unique telescoping mounting frame (Spans upto 24 IN on-center framing) fits through retrofit drywall opening to allow easy installation from the room side, no attic access needed, captive screws allow for easy new construction installation, mounting frame positioning tabs provide easy vertical positioning for new construction, easy to insert and remove snap-in housing, easy to insert and remove snap-in blower, inside or outside duct connector and knockout plate mounting provides flexibility for new construction or retrofit; 3 YR warranty