Aluminum Invisible Flange Joint is one of the main part of the fabrication of the phenolic air duct,it played a great role in connecting panels.The function of the Aluminum Invisible Flange Joint is  jointing the parts of duct which is also connected by PVC H Baynoet.About the package,normally it will be cutted in 4 meter long,80 meter per bundle and be packed by plastic film.It's for phenolic pre insulated duct used.

Product Features:

1.Thickness:20mm/30mm.

2.Length:4mtr length.

3.Specially for phenolic ductwork used.