8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Copper Coil-Insulated Line Set Installation is simple

Installation is simple

+ Product Details Size - 8"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 8"h is the size for the duct opening measurement only

with actual front end outer dimensions of 8"

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Copper Coil-Insulated Line Set Installation is simple+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 34" or 34" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 33. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum