18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size -

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

875" width X 9

+ Product Details Outer dimensions: 9

+ Product Details Size – 18"w X 14"h is the size for the duct opening measurement only

875" width X 8" height

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size -+ Product Details Size 18" x 22" or 22" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 23. 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