8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 6" Diameter Heavier gauge than needed

Heavier gauge than needed

Removable core for access to optional damper

Constructed from high-impact

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actual front end outer dimensions are approximately 30 5/8" width X 28 5/8" height

8" x 18" or 18" x 8" Cube Core Eggcrate Return Air Grille 6" Diameter Heavier gauge than needed+ 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