12" x 20" or 20" x 12" Cube Core Eggcrate Return Air Grille 18" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 26 5/8" height

75" width X 21

actual front end outer dimensions are approximately 27

+ Product Details Size – 18"w X 14"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 actual front end outer dimensions+ 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