Blower Wheel Type Forward-Curved Includes Drive Package Yes Assembly Unassembled Wheel Diameter 18 1/2 in Airflow @ 0.125 in SP 6 515 cfm Airflow @ 0.250 in SP 5 960 cfm Airflow @ 0.375 in SP 5 220 cfm Airflow @ 0.500 in SP 3 820 cfm Maximum Static Pressure 1/2 in wc Maximum Inlet Air Temperature 140 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 11.3 sones @ 0.250 in SP and 5 ft 13.8 sones @ 0.125 in SP and 5 ft Wheel Material Steel Housing Material Steel