6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille 6in diameter Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

actual front end outer dimensions are approximately 28 5/8" width X 16 5/8" height

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 8" Radial Damper

actual front end outer dimensions are approximately 42 5/8" width X 22 5/8" height -

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille 6in diameter Ideal for Walls & Ceilings:+ Product Details Size 6" x 8" or 8" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" width X 9. 75" height. 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%,