12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Grille w12h12 + Product Details Size –

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

Plain Ends - Gives you the freedom to cut and flare at your own project needs

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+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Grille w12h12 + Product Details Size –+ Product Details Size 12" x 30" or 30" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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