Motorized Impeller Impeller Type Backward Curve Motor Type Permanent Split Capacitor Fan Dia 8 21/32 in CFM @ 0.000-In. SP 543 cfm Voltage 230V AC 0.47 A Amps 107 W Watts 60 dBA Max Ambient Temp 140 Degrees F Depth 2 13/16 in Bolt Circle Dia 2 9/32 in Blade Material Fiberglass Reinforced Polyamide Mounting Position Universal 60 Hz Thermal Protection Auto Standards UL