18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

this grille seamlessly drops into the designated place

actual front end outer dimensions are approximately 32 5/8" width X 34 5/8" height

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 18in diameter actual front end outer dimensions+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 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