Features: Automatic Reset Overload Protector, Class B Insulated, Resilient & Rigid Base, Double Sealed Ball bearings, Extended Thru-Bolts 3?4" Past Nut, Reversible, Service Factor 1.0, Single Phase,Split Phase & Capacitor,Start Capacitor Run, Totally Enclosed Air Over, 1/3 thru 1 HP, 40°C Ambient, 60 Hz, 1800 RPM, Energy Efficient $ Applications: Designed for dirty environments such as poultry houses, barns, etc. fan & belted fan only 1/2 HP 1800 RPM 230/115 Volts 3.5/7.0 Amps 56Z Frame Cushion Base Shaft diameter is 1/2", N=1.94" with .04" deep flat 1.88" long Cross Reference: CH3523A W56S17T2002 X900