18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille sidewall + Product Details Outer dimensions:

+ Product Details Outer dimensions: 9

875" width X 8" height

Solid Base Construction – Features a solid base for stable installation and reliable protection

this easy-to-install grille fits seamlessly into any standard return filter opening

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

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille sidewall + Product Details Outer dimensions:+ 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