14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille with filter Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

+ Product Details Size – 36"w X 18"h is the size for the duct opening measurement only

Designed for optimal air flow and lasting durability

actual front end outer dimensions are approximately 24 5/8" width X 31 5/8" height

actual front end outer dimensions are 13

14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille with filter Actual Filter Size – 24+ Product Details Size 14" x 26" or 26" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 27. 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