12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum + Product Details Size –

+ Product Details Size – 28" x 28" is the size for the duct opening measurement only

so you are not left with much waste

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12" x 30" or 30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Aluminum + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 29. 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