6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size –

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior durability and reliable performance

actual front end outer dimensions are approximately 27 5/8" width X 30 5/8" height

color: #fff

6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size –+ 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