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Thermaflex®, 0557-0500-0001-10, Duct, 5 in ID, 25 ft Length, R4.2 Insulation Value, -20 to 200 to -20 to 250 deg F, Silver
- 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
- Inner core is self-extinguishing
- Ducts measure 4 to 20 in diameter