28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Traditional HVAC systems were designed

Traditional HVAC systems were designed for cold air

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actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

28" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Traditional HVAC systems were designed+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 16" OR 16" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 15. 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