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Xuanyuan acoustic pipe lagging-pvc exhaust duct We are very hopeful about a brighter future of our Xuanyuan branded products since their influence have already reached not only the domestic market but also the global market due to both their high-performance and our satisfactory after-sales service that comes with them. With our diligent work, our brand's overall competitiveness and customers' degree of satisfaction have been highly improved.3 inch aluminum flexible duct,insulated aluminum duct,aluminum flexible air duct.