16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille White + Product Details Size -

+ Product Details Size - 18"w X 22"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 30" X 6" duct openings

Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

+ Product Details Size - 30"w X 14"h is the size for the duct opening measurement only

16" x 24" or 24" x 16" Cube Core Eggcrate Return Air Grille White + 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