26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe box-shadow: 0 2px 4px rgba(0

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actual front end outer dimensions are approximately 20 5/8" width X 34 5/8" height

75" width X 5

actual front end outer dimensions are approximately 14 5/8" width X 28 5/8" height

26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe box-shadow: 0 2px 4px rgba(0+ Product Details Size 26" x 28" or 28" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 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