10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions

actual front end outer dimensions are 3"

+ Product Details Size - 25"w X 4"h is the size for the duct opening measurement only

Filter Grille features a user-friendly plastic latch that requires no screwdriver for opening

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 4" duct openings

10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in actual front end outer dimensions+ Product Details Size 10" x 12" or 12" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 13. 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