24" x 30" or 30" x 24" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" + Product Details Size –

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

+ Product Details Size - 20"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

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24" x 30" or 30" x 24" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" + Product Details Size –+ Product Details Size 24" x 30" or 30" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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