28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter } ul { margin-bottom: 15px

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+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 12"w X 10"h is the size for the duct opening measurement only

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28" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter } ul { margin-bottom: 15px+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 6" OR 6" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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