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The THERMAFLEX 056309000001 Flex-Vent KM features a strong polyester film laminated and encapsulating a heavy, corrosion-resistant steel wire helix. It forms the inner core and supports a thick blanket of fiberglass insulation. The outer vapor barrier is a bi-directional, reinforced metallized vapor barrier that will not unravel.
Insulated flex vent with polyester film, steel wire helix, and metallized vapor barrier.
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