duct fabrication machine weld preparation luster
duct fabrication making line flat welding flange luster. Duct Flange Forming Machine Manufacturer . Comifo, as one of the professional duct flange forming machine manufacturers in China, knows flange structure very well, and quite familiar with the standards of duct pressure test and leakage test, including SMACNA, DW144/142, GB50243-97 …
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