[Jie Weinuo to recommend the star product - Tianjin galvanized duct] Jie Weinuo Industrial duct flange plate thickness up to 1.5 thick fresh air duct design, duct length can reach 1.5 long. Duct Lidengkequ. [Jie Weinuo to recommend the star product - flange plate duct price advantage] Jie Weinuo unique production total of flange plate duct, spiral duct, angle iron flange duct, the group is good for galvanizing duct can be used as the reference point for both ends of the flange to the intermediate flange of the measuring point to send the new air ducts, cable measuring galvanized duct connection is straight, to be adjusted deviation is large. production and installation of train services. [Jie Weinuo to recommend the star product - a unique black and white iron duct price advantage] duct fabrication and installation should comply with design drawings, contracts, and the implementation of the relevant technical standards, are changed must change the design or contract visa approval notice or technology. 2.2 duct system before construction, construction units and construction units should, supervision, general contracting and design units to coordinate with other pipeline piping duct position to approve the reserved and cavity. Construction should