Insulation Board, Composite Insulation Board, Composite Duct manufacturer / supplier in China, offering Phenolic Foam Air Duct Insulation Board Phenolic Foam Panel, Pre-Insulated Air Duct Panel Phenolic Foam Insulation Material, Phenolic Foam Pre-Insulated Duct Panel with Galvanized Iron (GI) Sheet One Side and Aluminum Foil The Other Side and so on.