12" x 12" Cube Core Eggcrate Return Air Grille Return Grille 75" width X 21

75" width X 21

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+ Product Details Size - 10"w X 24"h is the size for the duct opening measurement only

12" x 12" Cube Core Eggcrate Return Air Grille Return Grille 75" width X 21+ Product Details Size 12" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 13. 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