NEW 6" x 25' JPL FLEX AIR DUCT INSULATION R6 HVAC N/R NEW! JPL FLEXIBLE AIR DUCT INSULATION # MHP25-R6 6" x 25' MHP-25R6 (25 length) flexible duct is constructed with a spring steel wire helix, encapsulated in a 2-ply, air tight inner-core. R6 fiberglass insulation encompasses the core and a unique metalized, reinforced vapor barrier surr...