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Xuanyuan 4 inch aluminum flex duct-2 inch insulated flexible duct Tailor-made services are professionally provided to meet different demands of our customers. For example, the specific designs could be provided by custmomers; quantity is able to be determined through dicussion. But we don't strive merely for quantity of production, we always put quality before quantity. 4 inch aluminum flex duct-2 inch insulated flexible duct is the evidence of 'quality first' at Xuanyuan Air Conditioning Equipment.hvac tubing,air duct pipe,spiral ductwork.