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Xuanyuan harga flexible duct 12 inch We established brand - Xuanyuan, wanting to help make our customers' dreams come true and do everything we can to contribute to society. This is our unchanging identity, and it is who we are. This shapes the actions of all Xuanyuan employees and ensures outstanding teamwork across all regions and business fields.4 inch insulated duct,hvac duct insulation,6 inch insulated flexible duct.