KAZE APPLIANCE SE90T Modern Ultra Quiet 90-CFM 0.3-Sones Bathroom Exhaust Fan, White 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. Barely audible sound level of less than 0.3-Sones at 90-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