Ventilation ducts are metal or composite ducts for ventilation and air conditioning engineering for industrial and civil buildings. They are a municipal infrastructure for air circulation and reducing the concentration of harmful gases.

The plates, profiles and other main finished materials used in the manufacture and installation of air ducts in ventilation ducts shall comply with the current national standards for design and related products, and shall be subject to the factory inspection certificate. Materials shall be accepted and accepted according to the relevant national standards. .

Generally: the purification system sends back the air duct, the central air-conditioning ventilation tube, the industrial air supply and exhaust ventilation pipe, the environmental protection system suction and exhaust air pipe, the mine drainage gas pipe, the mining rubber cloth wind pipe, etc.;