20" x 20" Cube Core Eggcrate Return Air Grille Material_Aluminum 12"w X 4"h Is The

12"w X 4"h Is The Size For The Duct Opening Measurement Only

No Sharp Surface Edges

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You may think of grilles and registers as a generic component of the ventilation system in your house

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20" x 20" Cube Core Eggcrate Return Air Grille Material_Aluminum 12"w X 4"h Is The+ Product Details Size 20" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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 electric