28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille Grille featuring a 8" round duct

featuring a 8" round duct opening

actual front end outer dimensions are approximately 34 5/8" width X 24 5/8" height

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

Its durability and performance contribute to overall comfort

28" x 36" or 36" x 28" Cube Core Eggcrate Return Air Grille Grille featuring a 8" round duct+ Product Details Size 28" x 36" or 36" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 37. 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