4" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length 2-Way Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Crafted from high-quality red oak wood

actual front end outer dimensions are approximately 29

This grille is ideal for both sidewall and ceiling installations

if your hole is 20" wide by 14" tall

4" Insulated Aluminum Flexible HVAC Duct R-8.0 – 25' Length 2-Way Insulation – A thick blanket+ 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