20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille w36h36 + Product Details Size –

+ Product Details Size – 8"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 28 5/8" height

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+ Product Details Size – 48"w X 24"h is the size for the duct opening measurement only

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille w36h36 + Product Details Size –+ Product Details Size 20" x 30" or 30" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 31. 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