Restaurant Model Backward Incline Roof Exhaust Fan Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Assembled Wheel Diameter 12 1/4 in Airflow @ 0.000 in SP 3 306 cfm Airflow @ 0.125 in SP 3.3 cfm Airflow @ 0.250 in SP 3 255 cfm Airflow @ 0.500 in SP 3 213 cfm Airflow @ 0.750 in SP 3 165 cfm Airflow @ 1.000 in SP 3 200 cfm Airflow @ 1.250 in SP 3 cfm Airflow @ 1.500 in SP 2 963 cfm Airflow @ 2.000 in SP 2 950 cfm