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Buy Marathon B303 model# 48S17D2055 Fan and Blower Motor for a quality machine that features: Ball bearings Auto overload 1.35 Service Factor 3/4thur bolts sgaft end 1/2shaft with 5/8adapter and key Automatic reset thermal protector prevents overheating. Patented MAXGuard insulation system offers superior protection for use with a variable frequency drive. Permanently lubricated double-sealed bearings extend the lifetime of the motor. Ambient temperature up to 70C allows for consistent operation in a range of environments and applications. Vertical/horizontal mounting for proper placement of the fan within airflow.