How to identify the quality of galvanized iron ducts

  To evaluate the quality of galvanized steel ducts, one can start from the following aspects: First, inspect the material. High-quality ducts are made of galvanized steel sheets produced by reputable manufacturers, with the thickness meeting standards and a uniform zinc coating on the surface, free of rust spots. Second, examine the craftsmanship. Check whether the duct joints are smooth, the seams are tight without gaps, the flange connections are secure, and the bolt spacing is uniform. Third, test the sealing. Conduct light or air leakage tests on the ducts to ensure no leaks. Fourth, listen to the sound. Tap the duct gently with your hand. A crisp sound indicates good material quality, while a dull sound may indicate poor material quality or internal voids. Fifth, check the labeling. Reputable products will have clear labeling indicating the manufacturer, specifications, and models, facilitating quality traceability.