12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size –

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

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

+ Product Details Size – 22" x 22" is the size for the duct opening measurement only

+ Product Details Outer dimensions: 25

+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size –+ Product Details Size 12" x 26" or 26" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 27. 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