12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 6in diameter Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 13 3/4" x 1"

+ Product Details Size - 26"w X 32"h is the size for the duct opening measurement only

75" width X 19

Actual Filter Size – 21 3/4"w x 23 3/4" x 1"

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 6in diameter Actual Filter Size – 7+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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