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 1 612 cfm Airflow @ 0.250 in SP 1 479 cfm Airflow @ 0.500 in SP 1 318 cfm Airflow @ 0.750 in SP 1 102 cfm Airflow @ 1.000 in SP 696 cfm Maximum Static Pressure 1 in wc Maximum Inlet Air Temperature 104 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 10.6 sones @ 0.250 in SP and 5 ft Frame Material Galvanized