Belt Driven Axial Downblast Exhaust Ventilator, (Less Drive Package), Roof Mounting Location, Base Width: 42", Base Length: 42", Maximum Inlet Temperature 180 F, HP Range 1/2 To 3, RPM Range: 465 To 835, CFM Range:6005 To 10,784 0.0" Speed Control: No, Bearing Type: Regreasable Pillow Block, Propeller Diameter: 261/2 ", Propeller Material: Steel, Housing Material: Spun Aluminum, Application: General Clean Air, Includes: Nema 1 Junction Box, Base Height: 13/4", Shaft Diameter Propeller End And Sheave End: 1", Overall Diameter: 50", Overall Height: 36", Weight: 245 Lbs, In Bulk, Made In USA