6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Powder Coated actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 28 5/8" height

High Quality – Solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

+ Product Details Size - 20"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 24"h is the size for the duct opening measurement only

6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Powder Coated actual front end outer dimensions+ Product Details Size 6" x 18" or 18" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 19. 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