8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille Copper Coil you can watch this informative

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

75"H – fits a 10" X 8" duct opening

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 34 5/8" width X 10 5/8" height

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille Copper Coil you can watch this informative+ Product Details Size 8" x 34" or 34" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 35. 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