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

Do not measure the overall size of the register itself

and its seamless drop-in installation process ensures effortless setup

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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