12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set background-color: #000

background-color: #000

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 20" duct opening (measured at the opening)

justify-content: center

actual front end outer dimensions are approximately 10 5/8" width X 34 5/8" height

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille Copper Coil-Insulated Line Set background-color: #000+ Product Details Size 12" x 28" or 28" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 29. 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