5" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length Insulated Line actual front end outer dimensions

actual front end outer dimensions are approximately 5

you have 16 different varieties to choose from

If your hole is 14" wide by 20" tall

that will overlap at wall joint

5" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length Insulated Line actual front end outer dimensions+ 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 8. 0 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