8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 6" Diameter Achieve superior control over your

Achieve superior control over your indoor airflow for a more comfortable space

Ideal for both residential and commercial environments

Actual Filter Size – 29 3/4"w x 5 3/4" x 1"

and brown – to harmonize with your interior theme

Heavier gauge than needed

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 6" Diameter Achieve superior control over your+ Product Details Size 8" x 18" or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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