These motors install with all standard 48 frame mounting brackets. They are a quiet operator and electrically reversible. There is an Automatic Thermal Overload Protector and they have class B insulation. The speed is 1075/3 RPM and 60 Hertz with low power consumption. The motor uses a 370 Vac Capacitor and has a standard 48 frame motor casing size. There is a continuous duty, air over on this motor and the 2.5 inch diameter hub rings are included.