16" x 20" or 20" x 16" Cube Core Eggcrate Return Air Grille Material_Aluminum actual front end outer dimensions

actual front end outer dimensions are 11

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16" x 20" or 20" x 16" Cube Core Eggcrate Return Air Grille Material_Aluminum actual front end outer dimensions+ Product Details Size 16" x 20" or 20" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 21. 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