Blower Wheel Type Forward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 10 5/8 in Airflow @ 0.125 in SP 1 690 cfm Airflow @ 0.250 in SP 1 600 cfm Airflow @ 0.375 in SP 1 480 cfm Airflow @ 0.500 in SP 1 370 cfm Airflow @ 0.750 in SP 1 140 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 Airflow @ 2.500 in SP Not Applicable