Transformer Cooling Fan, Blade Diameter 20 in, Air Flow 6,600 cfm, Voltage 115/230V AC, 60 Hz, Phase 1, Fan Mounting Type Guard Mount, 4.1/2.1 Amps, 1,725 RPM RPM, Motor HP 1/2 hp, Max. Ambient Temp. 104 Degrees F, Bearing Type Ball, Number of Blades 4, Blade Material Cast Aluminum, Fan Cord Length 15 ft, Guard Material Steel, 23 in Height, Width 23 in, 13 5/16 in Depth, Mounting Eye O.C. 17 3/4 in, Motor Enclosure Totally Enclosed Air-Over, Motor Insulation Class B, Frame 48Y Yoke Mount