26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP The unique sponge gasket ensures

The unique sponge gasket ensures an airtight seal

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

actual front end outer dimensions are approximately 26

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Made of High Quality Aluminum That Will Never Rust

26" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter RG66 Black-HP The unique sponge gasket ensures+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 25. 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 Made from