22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" + Product Details Size -

+ Product Details Size - 30"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 14"w X 32"h is the size for the duct opening measurement only

Complies with industry standards of USA: ASTM D-882

For enhanced airflow control

22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" + Product Details Size -+ 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