12" x 32" or 32" x 12" Cube Core Eggcrate Return Air Grille Width_20in + Product Details Size –

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

+ Product Details Size – 22"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 9 3/4" x 1"

+ Product Details Size - 30"w X 12"h is the size for the duct opening measurement only

10"w X 3"h Is The Size For The Duct Opening Measurement Only

12" x 32" or 32" x 12" Cube Core Eggcrate Return Air Grille Width_20in + Product Details Size –+ Product Details Size 12" x 32" or 32" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 33. 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