6" x 25" Length * R6 Insulation value. Required minimum in many building codes across the country * Polyethylene jackets provide a durable, scuff-resistant vapor barrier that provides improved protection against damaging ultra-violet light. * Installation is made easy with the reinforcing fiberglass yarn scrim, which acts as a rip-stop and prevents tearing * Rigorously tested by Underwriters Laboratories, Inc. in accordance with UL 181, The Standard for safety in Factory-Made Air Ducts and Air Connectors.