12" x 32" or 32" x 12" Cube Core Eggcrate Return Air Grille Aluminum Adjustable Curved Blade + Product Details Size –

+ Product Details Size – 36"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 32"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 8" duct openings

+ Product Details Size – 12"w X 22"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 16" Diameter

12" x 32" or 32" x 12" Cube Core Eggcrate Return Air Grille Aluminum Adjustable Curved Blade + Product Details Size –+ Product Details Size 12" x 32" or 32" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 33. 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