Class 1 insulated air duct UL/cUL 181. Flexible helix core made of 2-ply polyester laminate and corrosion resistant galvanized wire. Surrounded by a blanet of formaldehyde-free, fiberglass insulation that helps reduce heat and cool loss. Jacketed by a heavy-duty, fire-retardant, silver polyethylene vapor barrier with reinforced scrim.
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