In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 13 1/2 in Airflow @ 0.000 in SP 2 504 cfm Airflow @ 0.125 in SP 2 456 cfm Airflow @ 0.250 in SP 2 398 cfm Airflow @ 0.375 in SP 2 332 cfm Airflow @ 0.500 in SP 2 274 cfm Airflow @ 0.750 in SP 2 138 cfm Airflow @ 1.000 in SP 1 960 cfm Airflow @ 1.250 in SP 1 753 cfm Airflow @ 1.500 in SP 1 480 cfm Maximum Static Pressure 1 1/2 in wc