22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" Complies with industry standards of

Complies with industry standards of USA: ASTM D-882

Actual Filter Size – 25 3/4"w x 19 3/4" x 1"

High Quality – Solid rigid steel body for durability and reliability

color: #fff

22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" Complies with industry standards of+ Product Details Size 22" x 36" or 36" x 22" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 23. 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