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The total outer size of this grille is the listed size plus 2 and 5/8"
+ Product Details Size - 24"w X 22"h is the size for the duct opening measurement only
Actual Filter Size – 25 3/4"w x 7 3/4" x 1"
+ Product Details Size - 10"w X 36"h is the size for the duct opening measurement only
12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille White The total outer size of+ Product Details Size 12" x 36" or 36" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 37. 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