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Ventilation - Insulated Flex Duct 6in

6" x 25' F114 Insulated Flex Duct (Black Jacket) 

Insulated flex duct 6in 

$32.65 for 25 feet

http://www.supplyhouse.com/Hart-Cooley-51003-6-x-25-F114-Insulated-Flex-Duct-Black-Jacket