12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille 18" Diameter our damper is designed to

our damper is designed to perfectly align with your setup

Don’t worry

actual front end outer dimensions are approximately 12 5/8" width X 24 5/8" height

875" width X 15

+ Product Details Size – 24"w X 22"h is the size for the duct opening measurement only

12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille 18" Diameter our damper is designed to+ Product Details Size 12" x 20" or 20" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 21. 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