Blower Wheel Type Forward-Curved Includes Drive Package Yes Assembly Unassembled Wheel Diameter 15 1/2 in Airflow @ 0.125 in SP 4 425 cfm Airflow @ 0.250 in SP 4 240 cfm Airflow @ 0.375 in SP 3 960 cfm Airflow @ 0.500 in SP 2 700 cfm Maximum Static Pressure 1/2 in wc Maximum Inlet Air Temperature 140 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 11.9 sones @ 0.250 in SP and 5 ft 12.3 sones @ 0.125 in SP and 5 ft Wheel Material Steel Housing Material Steel