KAZE APPLIANCE SE90TH Ultra Quiet 90-CFM 0.3-Sones Bathroom Exhaust Fan with Humidity Sensor and Delay Timer 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. Fan operates when humidity level is above an adjustable set-point (~50% to ~80% RH); when humidity level drops down, the fan continues to operate for an additional preset time (5 to 30 minutes) and automatically shut down When humidity level drops down, the fan continues to operate for an additional preset time (5 to 30 minutes) then shut down Includes double hanger mounting bars. Both 4 & 6 inch duct adapter. Housing Dimension: 11 3/8 by 10 1/2 by 7 5/8 inch. Grille measures 13 by 14 inch ENERGY STAR qualified for efficient cost-saving operation. ETL-CETL,HVI. Three year manufacturer parts warranty