Standard Square Axial Fan Fan Shape Square Mounting Eye O.C. 4 1/8 in Height 4 11/16 in Depth 1 1/2 in Width 4 11/16 in CFM @ 0.000-In. SP 170 Watts 13.7 Voltage 24V DC - Hz 0.57 Amps Electrical Connection - Fans Lead Wires Sound Level 51 IP Rating IP20 Mounting Position Vertical or Horizontal Bearing Type Ball 3800 RPM Motor Design Brushless DC Motor Insulation Class A Thermal Protection Impedance Max Ambient Temp 158 Degrees F Blade Material Polybutylene