14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille Ceiling + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 20" OR 20" x 24" duct opening (measured at the opening)

The premium durable material guarantees that they will never rust or wear through

+ Product Details Size - 26"w X 28"h is the size for the duct opening measurement only

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14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille Ceiling + Product Details Perfect Fit+ Product Details Size 14" x 36" or 36" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 37. 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