18" x 32" or 32" x 18" Cube Core Eggcrate Return Air Grille Brown 16"w X 3"h Is The

16"w X 3"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 32"w X 8"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 6" duct openings

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+ Product Details Size – 28"w X 28"h is the size for the duct opening measurement only

18" x 32" or 32" x 18" Cube Core Eggcrate Return Air Grille Brown 16"w X 3"h Is The+ Product Details Size 18" x 32" or 32" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 33. 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