18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Perfect Fit

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

Filter Size - 23

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

actual front end outer dimensions are 26

75"H – fits a 12" X 10" duct opening

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille flat stamped steel + Product Details Perfect Fit+ 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