Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 30 in Airflow @ 0.250 in SP 10 677 cfm Airflow @ 0.500 in SP 10 228 cfm Airflow @ 0.750 in SP 9 771 cfm Airflow @ 1.000 in SP 9 298 cfm Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP 8 250 cfm Airflow @ 2.000 in SP 6 869 cfm Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable Airflow @ 3.500 in SP Not Applicable