16" x 22" or 22" x 16" Cube Core Eggcrate Return Air Grille Powder-Coat + Product Details Size –

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 4" duct openings

The premium durable material guarantees that they will never rust or wear through

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

16" x 22" or 22" x 16" Cube Core Eggcrate Return Air Grille Powder-Coat + Product Details Size –+ Product Details Size 16" x 22" or 22" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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