Available in 24 to 60 in. sizes, WEB belt drive panel fans feature a heavy duty 16 ga steel venturi with rugged tubular steel bracing. Permanently lubricated drive shaft bearings and ball bearing motor ensure long life operation. Motor options include 115/230 V 1 phase, 230/460 V 3 phase, and 575 V 3 phase. Belt drive capacities are available up to 39,000 cfm. Fans also include steel blade impeller and have industrial-grade gray enamel finish.