28" x 32" or 32" x 28" Cube Core Eggcrate Return Air Grille Return 75" width X 15

75" width X 15

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

For 14" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening)

+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

28" x 32" or 32" x 28" Cube Core Eggcrate Return Air Grille Return 75" width X 15+ Product Details Size 28" x 32" or 32" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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