8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers + Product Details Size –

+ Product Details Size – 10"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 8" or 8" x 6" is the size for the duct opening measurement only

+ Product Details Size - 36"w X 30"h is the size for the duct opening measurement only

8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Grille Outdoor Vent Covers + Product Details Size –+ Product Details Size 8" x 26" or 26" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 27. 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