10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 75"H – fits a 18"

75"H – fits a 18" X 12" duct opening

+ Product Details Size - 22"w X 4"h is the size for the duct opening measurement only

Equipped with a locking eight-tumbler key system

Mounted with a frame and bayonet joint

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille w25h25 75"H – fits a 18"+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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