30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core The total outer size of

The total outer size of this grille is the listed size plus 2 and 5/8"

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30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core The total outer size of+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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