Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 10 5/8 in Airflow @ 0.000 in SP 1 510 cfm Airflow @ 0.125 in SP 1 450 cfm Airflow @ 0.250 in SP 1 400 cfm Airflow @ 0.375 in SP 1 350 cfm Airflow @ 0.500 in SP 1 290 cfm Airflow @ 0.750 in SP 1 200 cfm Airflow @ 1.000 in SP 1 100 cfm Airflow @ 1.250 in SP 1 000 cfm Airflow @ 1.500 in SP Not Applicable Airflow @ 2.000 in SP Not Applicable