Whole House Fan Mounting Location Ceiling Quiet Design No Number of Speeds 2 Nameplate Voltage 115V AC Speed Controllable Yes Blade Diameter 42 in Drive Type Belt Drive Maximum Airflow 12 600 cfm Maximum Noise Level 15 sones Wattage 661 W Coverage Area 3 200 sq ft Rough Opening Type Square For High-Static Pressure Applications No High-Efficiency Motor No Number of Blades 4 Blade Material Steel Housing Material Steel Grille Material Not Applicable Standards UL Listed