12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set actual front end outer dimensions

actual front end outer dimensions are approximately 25

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 20" duct opening (measured at the opening)

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12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set actual front end outer dimensions+ Product Details Size 12" x 28" or 28" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 29. 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