12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille w16h16 Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 23 3/4" x 1"

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 16 5/8" height

+ Product Details Size – 25"w X 25"h is the size for the duct opening measurement only

12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Grille w16h16 Actual Filter Size – 19+ 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