Centrifugal Upblast Roof Exhaust Fan Drive Type Belt Wheel Diameter 18 1/2 in Base Diameter Not Applicable Base Length 29 1/8 in Base Width 29 1/8 in Maximum Static Pressure 2 in wc Assembly Unassembled Housing Material Gray Polyester Coating Steel Wheel Material Steel Mounting Location Roof Maximum Inlet Air Temperature 400 Degrees F Standards AMCA Sound Air UL/cUL 762 Overall Height 40 1/4 in Base Height 6.3 in