Galvanised spiral duct is a thin-walled pipe made of metal strip material rolled into a spiral to form a biting seam, weldless spiral appearance, round low pressure loss, mechanism bite without air leakage, bite reinforcing rib resistance to high pressure, equipped with standard flange holes, easy to install and operate, saving time and effort efficacy. Widely circulated spiral duct on the market is galvanised spiral duct made of zinc, zinc in dry air almost does not change, in the humid air, the zinc surface will produce dense alkaline zinc carbonate film to prevent corrosion and rust.

Galvanised spiral duct is widely used in air supply, exhaust, grease exhaust and exhaust ducts in hotels, shopping malls, textiles, chemical fibres, petrochemicals, machinery manufacturing, instrumentation, electronics, pharmaceuticals, tobacco, food, medical treatment, warehousing, office buildings as well as subways, human security, basements and other projects.