10" x 20" or 20" x 10" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Its smooth

Its smooth

+ Product Details Size – 24"w X 24"h is the size for the duct opening measurement only

Easy Unrestricted Air Flow For Your HVAC System

+ Product Details Size – 8" x 14" or 14" x 8" is the size for the duct opening measurement only

High Quality – Rigid aluminum construction with counter-sunk screw holes (screws included) and no sharp edges

10" x 20" or 20" x 10" Cube Core Eggcrate Return Air Grille 18" Round Duct Pipe Its smooth+ Product Details Size 10" x 20" or 20" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 21. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing