TD Pre-Insulated Aluminium Duct is specialized in the air distribution fields and the answer to economical, technical, and constructive question. Many different material and system such as composite, PVC, etc. had been developed as an alternative to the galvanized sheet metal used traditionally. TD Insulated Aluminium Duct is the solution. It is a sandwich panel composed of a layer base from good fire retardant rigid polyisocyanurate foam covering both sides with aluminium foil. The aluminium guarantees sturdiness and withstand corrosion in long term use.