18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Aluminum Adjustable Curved Blade + Product Details Size -

+ Product Details Size - 22"w X 16"h is the size for the duct opening measurement only

and slashes energy costs

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 14" or 14" x 6" duct opening (measured at the opening)

+ Product Details Size – 24"w X 16"h is the size for the duct opening measurement only

18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Aluminum Adjustable Curved Blade + Product Details Size -+ Product Details Size 18" x 20" or 20" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 21. 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