Ventilation ducts are metal or composite ducts for ventilation in industrial and civil buildings. Ventilation duct manufacturers are an infrastructure to reduce the concentration of harmful gases for air circulation. The ventilation ducts should be produced in strict accordance with the relevant national standards. The designed products must meet the national standards, and the acceptance inspection should also be carried out in accordance with the existing national standards during installation. Ventilation ducts are classified according to their materials. Air duct manufacturers are mainly divided into the following categories: steel duct (ordinary steel plate), galvanized sheet (white iron) duct, fabric duct, fiberglass duct, composite material duct, Double-sided aluminum foil insulation ventilation pipes, single-sided color steel insulation ventilation pipes, mining plastic ventilation pipes, etc.; according to the classification, there are return air pipes for purification systems, central air conditioning ventilation pipes, environmental protection systems, etc. The shapes of ventilation ducts are classified as circular, rectangular and spiral. For the processing of ventilation ducts, angle flange ducts, common plate flange ducts, etc. are mostly used. Different types of pipes are available for everyone to choose from.
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