18" x 32" or 32" x 18" Cube Core Eggcrate Return Air Grille Brown + Product Details Size –

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16

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

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18" x 32" or 32" x 18" Cube Core Eggcrate Return Air Grille Brown + Product Details Size –+ 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