20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core + Product Details Size –

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 22" or 22" x 8" is the size for the duct opening measurement only

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

+ Product Details Size – 36"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 20 5/8" height

20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille Aluminum - Cube Core + Product Details Size –+ 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