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 25

actual front end outer dimensions are approximately 34 5/8" width X 27 5/8" height -

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 18" or 18" x 12" duct opening (measured at the 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