14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Floor Grille + Product Details Size -

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

[Outer Dimensions: 32

with actual front end outer dimensions of 10"

actual front end outer dimensions are approximately 20 5/8" width X 338 5/8" height

+ Product Details Size – 8" x 28" or 28" x 8" is the size for the duct opening measurement only

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Floor Grille + Product Details Size -+ Product Details Size 14" x 18" or 18" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 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