- 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