16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille 10in diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 25 3/4" x 1"

+ Product Details Size – 6" x 30" or 30" x 6" is the size for the duct opening measurement only

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Actual Filter Size – 13 3/4"w x 17 3/4" x 1"

6" width X 9

16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille 10in diameter Actual Filter Size – 21+ Product Details Size 16" x 30" or 30" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 31. 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