Severe Duty Upblast Ventilator Less Drv Pkg Drive Type Belt Motor HP Range 1/4 to 2 RPM Range 845 to 1685 Base Height 1-3/4 In. Base Length 29-1/8 In. Base Width 29-1/8 In. Overall Height 34 In. CFM Range 1788 to 4495 @ 0.5 in SP Overall Dia 35-3/8 In. Shaft Dia Sheave End 1 In. Shaft Dia Wheel End 1 In. Mounting Location Roof Max Inlet Temp 400 Degrees Housing Material Steel Wheel Material Steel Wheel Type Backward Inclined Centrifugal Wheel Dia 18-1/2 In.