RETURN VENT INSULATION vs K-Flex Elastomeric Insulation Sheet

Buy the Elima-Draft return vent insulation for blocking cold drafts at a return vent or odd-sized grate. It is thin foil-bubble sheet with an R-3 value, cuts to any size from 12x12 up to 24x30 inches, and installs with tape or Velcro and no tools. The K-Flex sheet is a heavier 3/4-inch elastomeric foam with pressure-sensitive adhesive, rated for ducts, tanks and vessels from -40 to 200°F and plenum rated. It insulates better as a material but is awkward to fit inside a residential return grate and is not made for that job.

• Choose the Elima-Draft return vent insulation if you want to stop a draft through a return vent or an odd-sized grate and need something you can cut and stick on in minutes.
• Choose the K-Flex insulation sheet if you are wrapping ductwork, a tank or a vessel and want a thicker, plenum-rated foam with adhesive backing.