28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size –

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

ensuring a clean and smooth appearance in any environment

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28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size –+ Product Details Size 28" x 36" or 36" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 37. 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