18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 24 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

+ Product Details Size – 28"w X 8"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 24 5/8" height

actual front end outer dimensions are approximately 11

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 6" Diameter Actual Filter Size – 24+ 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