18" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length Aluminum while the ingenious dial-controlled damper

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

if your hole is 20" wide by 14" tall

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18" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length Aluminum while the ingenious dial-controlled damper+ 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