20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black + Product Details Size -

+ Product Details Size - The listed 12" diameter refers specifically to the size of the duct opening

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Actual Front End Outer Dimensions Are 8" Diameter

High Quality Copper Coil Meets/Beats ASTM B280 Standard for Air Conditioning and Refrigeration (Made From C12200 - 99

20" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Black + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 6" OR 6" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 5. 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