14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Floor Grille actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 30 5/8" height

only measure the "hole" in the wall/duct

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

5" width x 13

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Grille Floor Grille actual front end outer dimensions+ 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