Standard Square Axial Fan Fan Shape Square Mounting Eye O.C. 1 15/16 in Height 2 3/8 in Depth 1 in Width 2 3/8 in CFM @ 0.000-In. SP 18/17.5 Watts 3.2/3.3 Voltage 115V AC 60/50 Hz 0.185/0.191 Amps Electrical Connection - Fans Lead Wires Sound Level 31/30 IP Rating IP20 Mounting Position Vertical or Horizontal Bearing Type Zero Friction Air 4200/4100 RPM Motor Design Shaded Pole Motor Insulation Class A Thermal Protection Impedance Max Ambient Temp 158 Degrees F