20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 18 5/8" height

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actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10" Diameter actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 35. 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