Air King AK110LS Deluxe Quiet Exhaust FansThe Contoured Grill Almost Disappears into the Ceiling. At the Highest Point the Grill Projects Only 1/2" Down from the Ceiling. The Electronically Balanced Centrifugal Blower Wheel Assures Maximum Ventilation at Minimum Sound. The Deluxe Quiet Exhaust Fan Series Provide Powerful Ventilation, Low Sound Levels, Attractive Grills, and are Cost Effective to Operate. Energy Star Labeled, HVI2100 Certified Spring Loaded Metal Back Draft Damper UL Listed for Installation over a Tub or Shower on a GFCI Circuit Motors Suitable for Continuous Operation Easily Installs Using the Included Adjustable Hanging Brackets and are Available in Contractor Packs CFM (Air Movement): 110 Sones (Sound): 1.5 Exhaust Capacity: 100 - 135 sq. ft. Duct Size: 4" Metal Amps: 0.3