Blower Backward Incline Belt Drive Unassembled Wheel Diameter 20 Inches Shaft Diameter 1 3/16 Inch Airflow @ 0.250/1.500/3.000 Inches Static Pressure 8489/7664/6314 CFM Blower Speed 1690 RPM Includes 5 HP 230/460 Volt 3 Phase Motor Drives And Weatherproof Drive Cover Height 40 1/4 Inches Width 41 1/2 Inches Depth 34 1/2 Inches Inlet Diameter 21 1/2 Inches Outlet Height 21 1/2 Inches Outlet Width 15 7/8 Inches Maximum Inlet Air Temperature 250 Degrees F CW Rotation