12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter Actual Filter Size – 25

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

75" width X 25

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 16" or 16" x 6" duct opening (measured at the opening)

12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter Actual Filter Size – 25+ 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