Unassembled Inline Belt Drive Duct Blower Wheel Diameter 8-1/16 Inches Airflow @ 0.125/0.500/0.750 Inch Static Pressure 1345/1150/990 CFM Blower Speed 1396 RPM Sound Level @ 0.125 Inch Static Pressure 11.2 Sones Includes 1/2 HP 115/230 Volt Single Phase Motor And Drives Height 15 3/8 Inches Width 18 Inches Depth 23 Inches Uses Optional 3F537 Filter Rack