- Fan & blower - Split phase, Dripproof motors - Resilient base motors - Ball bearings (except as noted) - Overload auto - Variable torque on two speed motors - Extended thru-bolts, as noted - Heavy gauge steel frame and base - 48Y and 48YZ frame have 48/56 frame mounting holes - UL recognized and CSA certified - Model 5KH39QN9551X