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Xuanyuan 25 ft insulated flexible duct Xuanyuan glories in the fact that we are now capable of competing with many big brands with our increasing brand influence in the domestic and foreign markets after decades of efforts at shaping favorable and strong brand images. The pressure from our competitive brands has pushed us to continuously move forward and work hard to become the present strong brand.phonic trap ducting,8 inch flexible ductwork,rectangular flexible ductwork.