18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 21

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

actual front end outer dimensions are approximately 26 5/8" width X 14 5/8" height

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18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions+ 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