18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

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

+ Product Details Size - 10"w X 14"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 8" or 8" x 10" duct opening (measured at the opening)

Installation is hassle-free

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel Actual Filter Size – 21+ Product Details Size 18" x 22" or 22" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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