FEATURES: • Farm Duty, PSC, TEAO, Thru Bolt, Variable Speed. • Ball bearings. • Extended thru-bolts. • Automatic Thermal Protector. • Fully Gasketed. • 1/2'' Dia. x 2-1/2'' Long shaft with one flat, 90° apart. • 48/56 Frame mounting holes. • UL Recognized & CSA Certified APPLICATIONS: • Designed for demanding agricultural fan applications such as poultry houses and barn exhaust fans. Must be mounted within the airstream for proper cooling. Variable speed capabilities when used with a single phase speed control unit.