Unassembled Inline Belt Drive Duct Blower Wheel Diameter 15-1/2 Inches Airflow @ 0.125/0.250/0.500 Inch Static Pressure 4425/4240/2700 CFM Blower Speed 528 RPM Sound Level @ 0.125 Inch Static Pressure 12.3 Sones Includes 1 HP 230/460 Volt Three Phase Motor And Drives Height 28 Inches Width 33 1/2 Inches Depth 32 Inches Uses Optional 3F541 Filter Rack