6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille you can watch this informative

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

All of these grills have dampers

Operating from -40°F to +248°F

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

as the multidirectional design ensures consistent temperature control

6" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Supply Grille you can watch this informative+ 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