Motorized Impeller Impeller Type Backward Curve Motor Type Brushless DC Fan Dia 12 1/2 in CFM @ 0.000-In. SP 1 124 cfm Voltage 24V DC 3.75 A Amps 90 W Watts 64 dBA Max Ambient Temp 113 Degrees F Depth 4 3/4 in Bolt Circle Dia 2 1/4 in Blade Material Aluminum Mounting Position Vertical or Horizontal Thermal Protection Electronic Standards UL CSA Component Recognized Motor