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

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

Its sturdy construction guarantees a smooth

actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

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14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille Supply Grille + 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