26" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in actual front end outer dimensions

actual front end outer dimensions are approximately 24 5/8" width X 26 5/8" height

and the second number represents the height

providing maximum flexibility

+ Product Description Ventilate your home or commercial space with our Aluminum Outdoor Weatherproof Louvers

26" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 8" OR 8" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 7. 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