14" x 32" or 32" x 14" Cube Core Eggcrate Return Air Grille return grille diagonally feed it through the

diagonally feed it through the square hole

+ Product Details Size – 18"w X 24"h is the size for the duct opening measurement only

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size – 10" x 36" or 36" x 10" is the size for the duct opening measurement only

+ Product Details Size – 20"w X 6"h is the size for the duct opening measurement only

14" x 32" or 32" x 14" Cube Core Eggcrate Return Air Grille return grille diagonally feed it through the+ Product Details Size 14" x 32" or 32" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 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