KAZE APPLIANCE SE110T Ultra Quiet Bathroom Exhaust Ventilation Fan, 110-CFM, 0.9-Sones Please note the size of the housing is 11 3/8" x 10 1/2", resizing your existing ceiling opening will be needed if your current fan housing is smaller KAZE APPLIANCE ultra quiet series. Sound level of less than 0.9-Sones at 110-cfm Includes double hanger mounting bars. Both 4 & 6 inch duct adapter Energy star qualified for efficient cost-saving operation. Etl-cetl, hvi Three year manufacturer parts warranty