Star Industrial Co., Ltd. [Jie Weinuo recommend spiral duct] without adding any drop in the case of large diameter spiral duct, the same installation space 200mm diameter circular pipe can be replaced by a 250 × 150mm rectangular pipes. Under no additional installation space premise spiral duct 800, the number of parallel circular pipe to replace a flat rectangular pipe. Taking into account all the factors, in most cases, circular duct should be less than the space occupied by a rectangular duct. Star Industrial Co., Ltd. [Jie Weinuo recommend spiral duct seams] precision molding process: imports of equipment used are of special steel mold structure spiral duct 300, even with three to five years, the surface of the mold remains suppressed constant spiral duct, 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. Spiral duct manufacturers, Jixian spiral duct, preferred by 捷维诺 Jie Weinuo Industries (Tianjin) Co., Ltd. Jie Weinuo (Tianjin) Co., Ltd. (www.jieweinuo.com) strong, credible, in Tianjin fans, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jie Weinuo Industrial and you hand into the brilliant, for a better future!