20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black actual front end outer dimensions

actual front end outer dimensions are approximately 14 5/8" width X 30 5/8" height

actual front end outer dimensions are approximately 8

Actual Filter Size – 7 3/4"w x 33 3/4" x 1"

Actual Filter Size – 9 3/4"w x 31 3/4" x 1"

+ Product Details Size – 6" x 14" or 14" x 6" is the size for the duct opening measurement only

20" x 30" or 30" x 20" Cube Core Eggcrate Return Air Grille Color_Black actual front end outer dimensions+ Product Details Size 20" x 30" or 30" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 31. 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