14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in actual front end outer dimensions

actual front end outer dimensions are approximately 21 5/8" width X 31 5/8" height

actual front end outer dimensions are 22" width X 6" height

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14" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Width_20in actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 12" or 12" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 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