26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille Grille and versatile for any project

and versatile for any project

actual front end outer dimensions are approximately 16 5/8" width X 18 5/8" height

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

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if your hole is 20" wide by 14" tall

26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille Grille and versatile for any project+ 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