16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille 9% Pure Copper meeting ASTM

9% Pure Copper meeting ASTM B280 standards

actual front end outer dimensions are approximately 18 5/8" width X 18 5/8" height

Plain Ends - Gives you the freedom to cut and flare at your own project needs

Its smooth

85" width X 21

16" x 25" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille 9% Pure Copper meeting ASTM+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 25" OR 25" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 27. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 24. 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