Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 15 in Airflow @ 0.000 in SP 2 337 cfm Airflow @ 0.250 in SP 2 197 cfm Airflow @ 0.500 in SP 2 044 cfm Airflow @ 0.750 in SP 1 859 cfm Airflow @ 1.000 in SP 1 632 cfm Airflow @ 1.250 in SP 1 336 cfm Maximum Static Pressure 1 1/4 in wc Maximum Inlet Air Temperature 104 Degrees F Shaft Diameter 1 in Bearing Type Ball Sound Level 13.6 sones @ 0.250 in SP and 5 ft