18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Adjustable Return + Product Details Size -

+ Product Details Size - 4"w X 32"h is the size for the duct opening measurement only

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+ Product Details Size - 8" Diameter is the size for the duct opening measurement only

[Outer Dimensions: 38

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Adjustable Return + Product Details Size -+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 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