Star Industrial Co., Ltd. [Jie Weinuo recommend spiral duct seams] precision molding process: Die are special spiral duct fabrication of steel structures used imported equipment, even with three to five years, the surface of the mold remains suppressed constant spiral duct company, so that the surface of galvanized steel from damage, greatly extending the life of the duct, while the seam was smooth, tight seams, connections and strong, a good seal. [Jie Weinuo Industrial Star recommendation - spiral duct] Since the metal prone to chemical reactions in a variety of environments, causing corrosion, rust. While zinc hardly changed in the dry air. In humid air spiral duct standard, the zinc surface will generate basic zinc carbonate dense film. Spiral Duct Duct mainly in iron coated with zinc, iron play a protective role against. Zinc coating after passivation, dyeing or coating protective agent, can significantly improve their protective and decorative. Wuhai spiral duct | spiral duct manufacturing | Jie Weinuo fire smoke installation certification provided by merchants 捷维诺 (Tianjin) Co., Ltd. Jie Weinuo (Tianjin) Co., Ltd. (www.jieweinuo.com) is specialized in the "total of flange plate duct dampers, fans, ventilation ducts, evaporative air conditioners, cable tray" of the enterprise, the company adhering to the "integrity management, service intentions, "the idea, to provide you with the highest quality products and services. Welcome to inquire! Contact: Su Wei.