8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 12in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 12 5/8" height

durability

Solid Base Construction – Features a solid base for stable installation and reliable protection

+ Product Details Size - 16"w X 6"h is the size for the duct opening measurement only

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 12in diameter actual front end outer dimensions+ Product Details Size 8" x 18" or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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