Blower Wheel Type Forward-Curved Includes Drive Package Yes Assembly Unassembled Wheel Diameter 18 1/2 in Airflow @ 0.125 in SP 5 500 cfm Airflow @ 0.250 in SP 4 780 cfm Airflow @ 0.375 in SP 3 320 cfm Maximum Static Pressure 1/4 in wc Maximum Inlet Air Temperature 140 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 7.6 sones @ 0.250 in SP and 5 ft 9.6 sones @ 0.125 in SP and 5 ft Wheel Material Steel Housing Material Steel Number of Inlets 2