8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille w25h25 By simply measuring the width

By simply measuring the width or the length of the vent

+ Product Details Size - 24"w X 36"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 14" in diameter

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

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille w25h25 By simply measuring the width+ 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