Ventilation ducts are a kind of municipal infrastructure to circulate air and reduce the concentration of harmful gases. Ventilation pipes, plates, profiles and other main finished materials used in the production and installation of air pipes should comply with the design and relevant product national current standards, and the factory inspection certificate should be applied. The materials should be checked and accepted according to the current national standards when entering the site. Ventilation ducts are divided by material: generally: steel duct (ordinary steel plate), galvanized sheet (white iron) duct, stainless steel duct, glass fiber reinforced plastic duct, plastic duct, composite duct, color steel sandwich insulation board duct , Double-sided aluminum foil insulation ventilation pipe, single-sided color steel insulation ventilation pipe, rubberized cloth ventilation pipe (such as mine air duct), mining plastic ventilation pipe, etc.

Processing technology
Can be divided into angle iron flange duct, common plate flange duct

Shape classification
Generally: round, rectangular, spiral, etc.;

Use classification
Generally, there are: the return air duct of the purification system, the central air conditioning ventilation duct, the industrial air supply and exhaust ventilation duct, the suction and exhaust duct of the environmental protection system, the gas drainage pipe for mining, the air duct with rubberized cloth, etc.;

Air ducts are mainly used in industrial and construction engineering. The application fields mainly involve: electronic industry dust-free plant purification systems, medical and food sterile workshop purification systems, central air conditioning systems for hotels, shopping malls, hospitals, factories and office buildings, and industrial pollution control Dust removal, smoke exhaust, oil suction and other exhaust pipes, air supply pipes for industrial environment or job comfort, gas drainage systems for coal mine gas drainage, gas return air systems for coal mine environment control... etc.; PS: often Developed as a special route for escape and infiltration in film and animation