12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" The premium durable material guarantees

The premium durable material guarantees that they will never rust or wear through

6" width X 9

actual front end outer dimensions are approximately 24 5/8" width X 38 5/8" height

+ Product Description Maximize your home’s airflow with this premium 2-way air supply grille

Actual Filter Size – 13 3/4"w x 23 3/4" x 1"

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" The premium durable material guarantees+ Product Details Size 12" x 36" or 36" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 37. 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