Standard Square Axial Fan Fan Shape Square Mounting Eye O.C. 2 13/16 in Height 3 1/8 in Depth 1 1/2 in Width 3 1/8 in CFM @ 0.000-In. SP 75 Watts 6.7 Voltage 48V DC - Hz 0.14 Amps Electrical Connection - Fans Lead Wires Sound Level 51.5 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