Replacement Filter for Levoit Air Purifier Core 400S, Part Number Core 400S-RF, H13 HEPA Filtration, 5-Layer 3-in-1 Filter. Carefully check your model number to ensure compatibility with your air purifier. This filter is designed for use with Core 400S and Core 400S-RF models and performs as effectively as the original filter. H13 True HEPA Technology provides high-efficiency filtration with 360-degree coverage, capturing 99% of airborne particles as small as 0.3 micrometers, including dust, pollen, and smoke. Helps improve indoor air quality for easier breathing and better sleep. Activated Carbon Layer helps reduce household odors from pets, cooking, tobacco smoke, and volatile organic compounds (VOCs), delivering cleaner, fresher air. Easy to install—no cutting or additional tools required. Simply replace the old filter for continued optimal performance. It is recommended to replace the filter every 6 to 12 months to maintain air purifier efficiency. Color: White Material: Composite material Package Contents: 1 x Air Purifier Filter, 1 x Brush Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.