32" x 34" or 34" x 32" Cube Core Eggcrate Return Air Grille 18in diameter + Product Details Size -

+ Product Details Size - 20"w X 16"h is the size for the duct opening measurement only

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 10" duct openings

featuring a 8" round duct opening

75"H – fits a 18" X 4" duct opening

32" x 34" or 34" x 32" Cube Core Eggcrate Return Air Grille 18in diameter + Product Details Size -+ Product Details Size 32" x 34" or 34" x 32" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 33. 75" X 35. 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