Transformer Cooling Fan Blade Diameter 24 in Air Flow 7 900 cfm Voltage 115/230V AC 60 Hz Phase 1 Fan Mounting Type Guard Mount 4.7/2.4 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 27 in Height Width 27 in 13 5/16 in Depth Mounting Eye O.C. 19 7/8 in Motor Enclosure Totally Enclosed Air-Over Motor Insulation Class B Frame 48Y Yoke Mount