UNT PIR Pre-insulated Duct Panel consist of 20mm thickness closed cell PIR insulation foam and 60-80 micron thickness aluminum foil. The aluminum foil is embossed on both sides and coated with a 2g/㎡ layer of corrosion-resistant epoxy varnish paint. UNT PIR Air Duct Panel has a high performance insulating material with excellent thermal resistance and fire resistance. This kind of material has a wide range of applications in HVAC (Heating, Ventilation and Air Conditioning Duct) systems. It is a kind of fireproof duct board.