18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter + Product Details Size -

+ Product Details Size - 26"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 18" or 18" x 12" is the size for the duct opening measurement only

Installation Location – Suitable for both sidewall and ceiling installation

ensuring even air distribution throughout your space

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18" x 30" or 30" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter + Product Details Size -+ Product Details Size 18" x 30" or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 31. 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