16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" + Product Details Size -

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

+ Product Details Size - The listed 6" diameter refers specifically to the size of the duct opening

+ Product Details Size - 32"w X 24"h is the size for the duct opening measurement only

16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Grille Compatible with Duct 10" + Product Details Size -+ 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