Whole House Fan Mounting Location Window Quiet Design No Number of Speeds 3 Nameplate Voltage 120V AC Speed Controllable Yes Blade Diameter 20 in Drive Type Direct Drive Maximum Airflow 3 560 cfm Maximum Noise Level 4.6 sones Wattage 170 W Coverage Area 1 000 sq ft Rough Opening Type Square For High-Static Pressure Applications No High-Efficiency Motor No Number of Blades 3 Blade Material Steel Housing Material Plastic Grille Material Steel