20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum Actual Filter Size – 13+ 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