24" x 34" or 34" x 24" Cube Core Eggcrate Return Air Grille Copper Coil + Product Details Size –

+ Product Details Size – 36"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 5" Diameter is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening)

+ Product Details Size - 10"w X 8"h is the size for the duct opening measurement only

24" x 34" or 34" x 24" Cube Core Eggcrate Return Air Grille Copper Coil + Product Details Size –+ Product Details Size 24" x 34" or 34" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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