24" x 32" or 32" x 24" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood then you'll need a 14-inch

then you'll need a 14-inch round vent

+ Product Details Size - 12"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 31 5/8" height

+ Product Details Size - 18"w X 12"h X 2"d (for duct opening measurement only)

24" x 32" or 32" x 24" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood then you'll need a 14-inch+ Product Details Size 24" x 32" or 32" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 75" X 33. 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