Blower Wheel Type Forward-Curved Includes Drive Package Yes Assembly Unassembled Wheel Diameter 15 1/2 in Airflow @ 0.125 in SP 4 945 cfm Airflow @ 0.250 in SP 4 790 cfm Airflow @ 0.375 in SP 4 600 cfm Airflow @ 0.500 in SP 4 270 cfm Airflow @ 0.750 in SP 980 cfm Maximum Static Pressure 3/4 in wc Maximum Inlet Air Temperature 140 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 14.7 sones @ 0.250 in SP and 5 ft 15.2 sones @ 0.125 in SP and 5 ft Wheel Material Steel