28" x 28" Cube Core Eggcrate Return Air Grille Color_Red Oak Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 15 3/4" x 1"

Actual Filter Size – 27 3/4"w x 11 3/4" x 1"

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28" x 28" Cube Core Eggcrate Return Air Grille Color_Red Oak Actual Filter Size – 24+ Product Details Size 28" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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 electric