12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_White actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 18 5/8" height

+ Product Details Size – 18" x 26" or 26" x 18" is the size for the duct opening measurement only

with an additional 1 7/8" width and 2" height

+ Product Details Size - 16"w X 26"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_White actual front end outer dimensions+ Product Details Size 12" x 22" or 22" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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