6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Both lines taped together every 18in for easier handling & installation

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

All of these grills have dampers

Heavier gauge than needed

6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille Insulation – A thick blanket+ Product Details High Quality Aluminum housing on the outside and on the inside for the best insulation value Insulation A thick blanket of fiberglass insulation provides you with an R Value of 4. 2 Energy Efficient Air tight inner core decreases the pressure loss and provides a more hygienic environment high energy efficient No fiberglass erosion into air stream Design Designed to withstand bends and sharp turns without kinking. Tough reinforced