A total of plate flange duct, also known as no flange duct, its production form than the traditional rectangular duct processing speed faster, more convenient, smaller air leakage rate. The advantage is to save materials, reduce investment in engineering; air leakage is small, reduce energy consumption, save operating costs, popular construction enterprises welcome. The United States and Europe and other developed countries from the nineties began to use ductless flange connection, the current process has been widely used in a variety of projects. China's national standard GB50243-2002 on the "ventilation and air conditioning construction and acceptance of norms" clearly stipulates that the moment the wind pipe can be used flangeless connection process.
     In recent years, as air conditioning, ventilation systems in the important part of the ducts are increasing every year, its requirements are getting higher and higher. The progress of science and technology makes the production of air duct, the installation of the use of new materials, new technology after another, a total plate flange duct is one of them. A total of flange flange duct factory line has become a large construction and installation enterprises of the necessary equipment, and whether the production of a total plate flange duct has become the impact of key HVAC projects to undertake an important factor.