12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter actual front end outer dimensions

actual front end outer dimensions are approximately 18 5/8" width X 20 5/8" height

Actual Filter Size – 24 3/4"w x 25 3/4" x 1"

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

with screws included to make setup quick and hassle-free

12" x 34" or 34" x 12" Cube Core Eggcrate Return Air Grille return filter actual front end outer dimensions+ 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