Ultra Silent, High Performance Very quiet fan for ceiling mounted Hold Three speeds ceiling mounted fan that's designed to operate continuously and quietly Built-in Humidity Sensor detects up to 50-100%RH Specifications Static Pressure (in inches w.g.) 0.1 | 0.25 Speed Setting (CFM) 110/80/50 | 110/80/50 Air Volume (CFM) 113/88/55 | 97/70/45 Sound Level (sones) 0.9/0.5/<0.3 | 1.5/1.2/1.3 Fan Watts 9.6W/5.9W/3.5W | 11.2W/7.8W/5.9W Duct Diameter 4" Power Rating 120V /60Hz Housing Size 9"×9"×5-3/4" Grille Dimensions 11-7/8"×11-3/8"