According to the requirements of GB51251-2017 "Technical Standards for Smoke Prevention and Exhaust Systems in Buildings", it is developed according to the experimental process of GBT17428-2009 "Test Method for Fire Resistance of Ventilation Ducts". This kind of air duct adopts anti-corrosion metal plate + inorganic silicon refractory layer + Inorganic polycrystalline heat insulation layer + four-layer structure of anti-corrosion metal plate. It meets the requirements of the new smoke regulations for the fire resistance, heat insulation and integrity of the air duct, and has the advantages of beautiful appearance, light weight and convenient installation. It is currently an ideal smoke prevention and exhaust duct.
