30" x 30" Cube Core Eggcrate Return Air Grille steel + Product Details Size –

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

+ Product Details Size – 10"w X 6"h is the size for the duct opening measurement only

75"H – fits a 16" X 4" duct opening

+ Product Details Size - 24"w X 12"h X 2"d (for duct opening measurement only)

30" x 30" Cube Core Eggcrate Return Air Grille steel + Product Details Size –+ Product Details Size 30" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 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 electric