KAZE APPLIANCE SE90TMH Ultra Quiet Bathroom Fan with Humidity & Motion Sensor, 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. Designed to start running at adjustable preset low speed upon powering on to meet continuous ventilation requirement Fan operates when humidity level is above an adjustable set-point from ~50% to ~80% rh (relative humidity) When motion is detected, fan boosts up to 90-cfm for an adjustable preset duration (3 to 30 min) and under grille led indicator light on Energy star qualified for efficient cost-saving operation. Etl-cetl,hvi. Three year manufacturer parts warranty