In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 16 in Airflow @ 0.000 in SP 4 004 cfm Airflow @ 0.125 in SP 3 911 cfm Airflow @ 0.250 in SP 3 818 cfm Airflow @ 0.375 in SP 3 725 cfm Airflow @ 0.500 in SP 3 628 cfm Airflow @ 0.750 in SP 3 402 cfm Airflow @ 1.000 in SP 3 146 cfm Airflow @ 1.250 in SP 2 815 cfm Airflow @ 1.500 in SP 2 311 cfm Maximum Static Pressure 1 1/2 in wc