Standard Square Axial Fan Fan Shape Square Mounting Eye O.C. 3 1/4 in Height 3 5/8 in Depth 1 1/2 in Width 3 5/8 in CFM @ 0.000-In. SP 123 Watts 12.2 Voltage 24V DC - Hz 0.51 Amps Electrical Connection - Fans Lead Wires Sound Level 57.6 IP Rating IP20 Mounting Position Vertical or Horizontal Bearing Type Ball 4900 RPM Motor Design Brushless DC Motor Insulation Class A Thermal Protection Impedance Max Ambient Temp 158 Degrees F Blade Material Polybutylene