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6" x 25' Insulation for Flex Duct - 8TC070-6X25
$114.008TC070-6X25 is a 6 inch by 25 feet insulated to sleeve over a six inch aluminum flex duct (DB625). Silicone sold separately SIL500 Installation Instructions Specifications -
6" x 25' Aluminum Flex Liner - DB625
National Chimney$299.43DB625 is a 6 inch by 25 feet aluminum flex liner that can be attached to an outside air adapter. Insulation and silicone are sold separately - part #s 8TC070-6X25 and SIL500 Genuine OEM part