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Xuanyuan air duct insulation-air duct tubing The biggest difference between Xuanyuan and other brands is the concentration on the products. We promise to pay 100% attention to our products. One of our customers says: 'The details of the products are impeccable' , which is the highest evaluation of us. Because of our meticulous attention, our products are accepted and praised by customers around the world.flexible ducting for air conditioning,5 inch flexible duct,8 inch flex duct.