20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" actual front end outer dimensions

actual front end outer dimensions are approximately 14 5/8" width X 38 5/8" height

Available in both standard and custom sizes

designed to distribute air evenly throughout your space

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 6" duct openings

+ Product Details Size – 10"w X 30"h is the size for the duct opening measurement only

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Compatible with Duct 6" actual front end outer dimensions+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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