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 2 465 cfm Maximum Noise Level 1.5 sones Wattage 250 W Coverage Area 1 233 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