Severe Duty Upblast Ventilator Less Drv Pkg Drive Type Belt Motor HP Range 1/4 to 1 RPM Range 875 to 1390 Base Height 1-3/4 In. Base Length 25-1/8 In. Base Width 25-1/8 In. Overall Height 30 In. CFM Range 2515 to 3996 @ 0.0 in SP Overall Dia 28-7/8 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 16-1/2 In.