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 28" x 28" 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 Filter Size – 15 3/4"w x 21 3/4" x 1"

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

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

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