6" x 22" or 22" x 6" Cube Core Eggcrate Return Air Grille Round Damper Ring Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 4" duct openings

Design – Rigid gauge built for durability and long life in mind

75"H – fits a 20" X 8" duct opening

+ Product Details Size - 30"w X 12"h is the size for the duct opening measurement only

6" x 22" or 22" x 6" Cube Core Eggcrate Return Air Grille Round Damper Ring Ideal for Walls & Ceilings:+ Product Details Size 6" x 22" or 22" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 23. 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