PVC 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 PVC Invisible Flange is jointing the parts of duct which is also connected by PVC H Baynoet.Our PVC accessories are fire prooof.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.
3.Specially for phenolic ductwork used.
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