28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille + Product Details Perfect Fit

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

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 6" in diameter

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 34" OR 34" x 26" duct opening (measured at the opening)

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille + Product Details Perfect Fit+ Product Details Size 28" x 34" or 34" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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