12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille 2-Way actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

rust-free aluminum construction with smooth finished edges and counter-sunk screw holes (screws included)

actual front end outer dimensions are approximately 14 5/8" width X 22 5/8" height

Rust-Free Aluminum - Made from strong

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille 2-Way actual front end outer dimensions+ Product Details Size 12" x 36" or 36" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 37. 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