Blower Wheel Type Forward-Curved Includes Drive Package Yes Assembly Unassembled Wheel Diameter 18 1/2 in Airflow @ 0.125 in SP 10 000 cfm Airflow @ 0.250 in SP 9 680 cfm Airflow @ 0.375 in SP 9 325 cfm Airflow @ 0.500 in SP 8 950 cfm Airflow @ 0.750 in SP 8 025 cfm Airflow @ 1.000 in SP 6 550 cfm Maximum Static Pressure 1 in wc Maximum Inlet Air Temperature 140 Degrees F Shaft Diameter 1 in Bearing Type Ball