16" x 20" or 20" x 16" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size –

+ Product Details Size – 6"w X 12"h is the size for the duct opening measurement only

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This grille is ideal for both sidewall and ceiling installations

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

16" x 20" or 20" x 16" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size –+ 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