12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter + Product Details Size –

+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only

Actual Filter Size – 25 3/4"w x 35 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 4" duct openings

One Towards The Top Of The Door

12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter + Product Details Size –+ Product Details Size 12" x 34" or 34" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 35. 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