These highly efficient flex ducts feature a core that is bonded to the steel wire coil to support the fiberglass insulation. Duct insulation is available in three different R-values for varied thickness: R-4.2, R-6.0 and R-8.0 The acoustically rated, polyethylene inner liner on these HVAC ducts eliminates noise and easily expands Spiral ducts are mold and mildew resistant Temperature range is from -20F to 200F and -20F to 250F intermittent Inner core is self-extinguishing Ducts measure 4-20" in diameter Greenguard certified 10 Year Limited Warranty..
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