Whole House Fan Mounting Location Ceiling Quiet Design Yes Number of Speeds 2 Nameplate Voltage 120V AC Speed Controllable No Blade Diameter 16 in Drive Type Direct Drive Maximum Airflow 3 081 cfm Maximum Noise Level 1.7 sones Wattage 285 W Coverage Area 1 541 sq ft Rough Opening Type Square For High-Static Pressure Applications Yes High-Efficiency Motor Yes Number of Blades 3 Blade Material Steel Housing Material Steel Grille Material Aluminum Standards UL Listed