Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 13 1/2 in Airflow @ 0.000 in SP 2 032 cfm Airflow @ 0.250 in SP 1 926 cfm Airflow @ 0.500 in SP 1 817 cfm Airflow @ 0.750 in SP 1 685 cfm Airflow @ 1.000 in SP 1 525 cfm Airflow @ 1.250 in SP 1 341 cfm Airflow @ 1.500 in SP 1 091 cfm Maximum Static Pressure 1 1/2 in wc Maximum Inlet Air Temperature 104 Degrees F Shaft Diameter 1 in Bearing Type Ball