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This kind of air duct panels with the PF as the core metrial with the color steelon both sides, the hardness is very strong. Color steel air duct compound air ductcan be used to in every variety warm air condition air duct, defend row tube etc..With tradition haveinorganic compound air duct more and more economy energy, more environmental protection more safety, more economy, Color steel air ductinorganic compound air duct have six price of show the Zhao ratio advantage, market foreground vast.