22" x 28" or 28" x 22" Cube Core Eggcrate Return Air Grille Material_Steel and smooth surface for years

and smooth surface for years to come

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

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+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

22" x 28" or 28" x 22" Cube Core Eggcrate Return Air Grille Material_Steel and smooth surface for years+ Product Details Size 22" x 28" or 28" x 22" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 23. 75" X 29. 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