Confined Space Centrifugal Blower Air Driven 4 hp HP Duct Dia 8 in Material Steel Blower/Fan Speed 3 000 RPM Maximum Flow in Free Air 3 000 cfm Inlet Connection 8 in Max Inlet Pressure 60 psi Air Consumption 10 to 100 cfm Standards CE Color Gray Length 23 in Width 12 in Height 19 in Includes Grounding Lug Conductive Housing and Aluminum Blower Wheel