20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille w12h12 actual front end outer dimensions

actual front end outer dimensions are 37

85" width X 21

Actual Filter Size – 25 3/4"w x 19 3/4" x 1"

+ Product Details Size - 30"w X 30"h is the size for the duct opening measurement only

our grill boasts an impressive 96% airflow capacity

20" x 28" or 28" x 20" Cube Core Eggcrate Return Air Grille w12h12 actual front end outer dimensions+ Product Details Size 20" x 28" or 28" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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