CAREFULLY CHECK YOUR MODEL NUMBER to ensure this is the correct filter for your air purifier. This filter is compatible with air purifier models Core 400S and Core 400s-RF. Performs as well as the original unit filter.Cost-Effective Value Pack: Designed to meet your year-round air cleaning needs. Offers high-level filtration performance for extended use. It is recommended to replace the filter every 6 to 12 months. Using an old or worn filter may reduce the efficiency of your air purifier.H13 True HEPA Technology: Features a high-grade true HEPA material with 360-degree filtration. Captures 99% of airborne particles as small as 0.3 micrometers in diameter. Helps improve indoor air quality for easier breathing and better sleep, reducing sniffles and sneezing.Efficient Odor Removal: Activated carbon layer helps reduce unpleasant odors and fumes, including volatile organic compounds (VOCs), tobacco smoke, cooking odors, and pet odors, contributing to cleaner, fresher indoor air.Easy Installation: Designed to fit Core 400S models. No cutting or modifications required. Replace your old filter quickly and easily without additional tools.Color: White Material: Composite material Package Contents: 1 x Air Purifier Filter 1 x Brush Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display settings may cause slight variations in the color shown in images compared to the actual product. Measurement may vary by +/- 1-3 cm.