6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Black + Product Details Size –

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

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

For a visual guide on how to measure your vent hole before ordering a grille

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Black + Product Details Size –+ Product Details Size 6" x 30" or 30" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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