18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille 8in diameter 14"w X 4"h Is The

14"w X 4"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 4"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 2"w X 14"h is the size for the duct opening measurement only

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille 8in diameter 14"w X 4"h Is The+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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