26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 30 5/8" height

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Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

this easy-to-install grille fits seamlessly into any standard return filter opening

this filter grille never rusts and withstands long-term use in any environment

26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 11. 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