14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille with filter actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 20 5/8" height

Actual Filter Size – 21 3/4"w x 27 3/4" x 1"

+ Product Details Size – 12" x 36" or 36" x 12" is the size for the duct opening measurement only

Designed for optimal air flow and lasting durability

+ Product Details Size – 22" x 26" or 26" x 22" is the size for the duct opening measurement only

14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Grille with filter actual front end outer dimensions+ 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