26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 8" OR 8" X 16" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 30" OR 30" x 26" duct opening (measured at the opening)

Actual Front End Outer Dimensions Are 14" Diameter

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Actual Filter Size – 24 3/4"w x 27 3/4" x 1"

26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille 8" Round Duct Pipe + Product Details Perfect Fit+ 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