Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 9 in Airflow @ 0.000 in SP 1 180 cfm Airflow @ 0.125 in SP 1 160 cfm Airflow @ 0.250 in SP 1 125 cfm Airflow @ 0.375 in SP 1 090 cfm Airflow @ 0.500 in SP 1 035 cfm Airflow @ 0.750 in SP 855 cfm Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP Not Applicable Airflow @ 2.000 in SP Not Applicable