8" x 20" or 20" x 8" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper See chart below:

See chart below:

These grilles and registers give you an extra measure of quality that are visible to your family members and house guests

strong aluminum construction with smooth finished edges for easy and safe use

actual front end outer dimensions are approximately 31

8" x 20" or 20" x 8" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper See chart below:+ Product Details Size 8" x 20" or 20" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 21. 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