6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille All of these grills have

All of these grills have dampers

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

Heavier gauge than needed

6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille All of these grills have+ 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