10" x 28" or 28" x 10" Cube Core Eggcrate Return Air Grille 12" Diameter Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 31 3/4" x 1"

this grille boasts a natural warmth and fine finish

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 6" duct openings

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

See our separate listing for Butterfly Dmaper to Control Airflow

10" x 28" or 28" x 10" Cube Core Eggcrate Return Air Grille 12" Diameter Actual Filter Size – 27+ Product Details Size 10" x 28" or 28" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 29. 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