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Ventilation - Insulated Flex Duct 4in

4" Insulated Flex Duct (25 Ft) black

Insulated flex duct 4in 

$24.95 for 25 feet

http://www.supplyhouse.com/Hart-Cooley-51001-4-x-25-F114-Insulated-Flex-Duct-Black-Jacket