8" x 8" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper + Product Details Size -

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

85" width X 13

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

+ Product Details Size – 24"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 2"h is the size for the duct opening measurement only

8" x 8" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper + Product Details Size -+ Product Details Size 8" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 9. 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 bills