10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

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+ Product Details Size – 8" x 12" or 12" x 8" is the size for the duct opening measurement only

10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -+ Product Details Size 10" x 16" or 16" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 17. 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