12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size -

+ Product Details Size - 12"w X 18"h is the size for the duct opening measurement only

background: #f8f9fb

and sound level range of NC 25 to 35

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings

actual front end outer dimensions are approximately 18 5/8" width X 30 5/8" height

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size -+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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