Thermo-efficient insulated Heating & A/C Duct. Black CPE core (bonded to coated wire helix) easily expands over fittings & supports thick blanket of fiberlass insulation. #471 has fiberglass reinforced metalized cover (sizes 4", 5", 6"). #470 (3") does not have the metalized cover. Rated R-42. Operating temperatures (-29°C to +121C). Meets UL 181, NFPA 90A and 90B. 25' lengths, sold by the foot. Cut lengths are not returnable.
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