20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 21 3/4" x 1"

+ Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

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

20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core Actual Filter Size – 24+ Product Details Size 20" x 32" or 32" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 33. 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