4" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Color_White + How To Measure A

+ How To Measure A Grille Overall Size:

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+ Product Details Size – 14" X 4" is the size for the duct opening (floor/vent hole) measurement only

+ Product Details Size – 8" x 16" or 16" x 8" is the size for the duct opening measurement only

4" Insulated Aluminum Flexible HVAC Duct R-4.2 – 25' Length Color_White + How To Measure A+ 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