16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille rg1010 + Product Details Size –

+ Product Details Size – 26"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 14"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 10" duct openings

+ Product Details Size – 20"w X 22"h is the size for the duct opening measurement only

16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille rg1010 + Product Details Size –+ Product Details Size 16" x 24" or 24" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 25. 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