Whole House Fan Mounting Location Ceiling Quiet Design Yes Number of Speeds 1 Nameplate Voltage 120V AC Speed Controllable No Blade Diameter 14 in Drive Type Direct Drive Maximum Airflow 1 472 cfm Maximum Noise Level 1.3 sones Wattage 117 W Coverage Area 736 sq ft Rough Opening Type Square For High-Static Pressure Applications Yes High-Efficiency Motor No Number of Blades 3 Blade Material Steel Housing Material Steel Grille Material Aluminum Standards UL Listed