... OEM producing experience air duct joint 1:Section Drawings:1,bolt 2,nut 3,gasket 4,inner race flange 5,corrugation pipe ... 6,dorsal plate flange 7,inner sleeve pipe flange 8,outer sleeve pipe flange 9,outer sleeve ... : -40~-300°C5:Types and Marks:F:product code(air duct)U:product code(waveform) B:Produt code(corrugation) 6:connection ...