8" x 22" or 22" x 8" Cube Core Eggcrate Return Air Grille Compatible with Duct 8" + Product Details Size -

+ Product Details Size - 18"w X 28"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 6" duct openings

+ Product Details Size - The listed 8" diameter refers specifically to the size of the duct opening

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

8" x 22" or 22" x 8" Cube Core Eggcrate Return Air Grille Compatible with Duct 8" + Product Details Size -+ Product Details Size 8" x 22" or 22" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 23. 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