Stamping factory Duct Production | Brand Duct preferred 捷维诺 Certified | Jixian stamping factory duct provided by 捷维诺 (Tianjin) Co., Ltd. Jie Weinuo (Tianjin) Co., Ltd. (www.jieweinuo.com) is specialized in the "co-flange duct dampers, fans, ventilation pipes, evaporative air conditioners, cable tray," the business, the company adhering to the "integrity business, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Su Wei. [Jie Weinuo Industrial Co., Ltd. Star recommendation spiral spiral duct] shall comply with the requirements of this standard stamping factory custom duct and comply with prescribed procedures approved drawings and technical documents. When both parties have the technical agreement stamping factory duct, press both the technical protocol design and manufacturing. 1, spiral size, shape spiral length 1.1 1.1.1 usual length: 6 ~ 12m stamping factory duct outlets, by mutual agreement stamping factory production duct length can be lengthened or shortened. 1.1.2 Length Length: cut length should be within the scope of a long pass, which limit deviation of ± 500mm. 1.1.3 fine cut length: By mutual agreement, the length limit deviations can supply more stringent precision cut lengths than the provisions of 1.1.2. 1.2 roundness spiral pipe end 100mm in length, the maximum outer diameter of the pipe shall be 1% larger than the nominal outside diameter of the smallest outer diameter shall not be smaller than the nominal outside diameter of 1%. Use of the ability to measure the maximum and minimum outside diameter caliper, bar gauge or other measurement tool. [Jie Weinuo recommend to you the star product - Tianjin galvanized duct] My company has the most advanced fifth-generation co-flange duct automatic production lines, Nissan duct 2400 m2. The production line of stainless steel, galvanized duct board is available in the form of plug or connect it directly compressed angle duct can also be integrally formed with the flange plates altogether.