18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille w12h12 this diffuser ensures long-lasting durability

this diffuser ensures long-lasting durability and adds a touch of elegance to any space

actual front end outer dimensions are approximately 28 5/8" width X 22 5/8" height

+ Product Details Size - 8"w X 8"h X 2"d (for duct opening measurement only)

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Grille w12h12 this diffuser ensures long-lasting durability+ 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