Bearing trade-offs for cooling fans - Power Electronic Tips
Difference between ball bearings and sleeve bearings in compact fans - From Blog
Fasco D7909 5.6" Frame Open Ventilated Permanent Split Capacitor Condenser Fan Motor with Ball Bearing, 1/4HP, 1075rpm, 208-230V, 60Hz, 1.8 amps: Electric Fan Motors: Amazon.com: Tools & Home Improvement
Fan bearing types – Weighing the pros and cons | Arrow.com
Ball Bearing and Sleeve Bearing Fans | Pelonis Technologies, Inc.
Sleeve vs. Ball Bearings - Short 127 - HVAC School
ORM5458 - Century ORM5458 - 5-5/8" HeatMaster Condenser Fan Motor w/ Sleeve Bearing (208-230V, 1075 RPM, 1/3, 1/6 HP)