28" x 30" or 30" x 28" Cube Core Eggcrate Return Air Grille Compatible With Duct 12in so you are not left

so you are not left with much waste

actual front end outer dimensions are approximately 27 5/8" width X 12 5/8" height

7/8” - 3397 PSI

actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

28" x 30" or 30" x 28" Cube Core Eggcrate Return Air Grille Compatible With Duct 12in so you are not left+ Product Details Size 28" x 30 or 30" 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