Compatible with Core 400S filter replacement for Core 400S and 400S-RF air purifiers. Designed to fit your air purifier precisely. Perfect size, high quality, low noise, and reliable performance. This replacement filter offers advanced filtration technology at a lower cost, making it a smart investment for maintaining clean indoor air. The replacement filter features an H13 True HEPA filter, activated carbon filter, and nylon pre-filter. It captures 99.97% of airborne particles as small as 0.3 microns and helps reduce odors, VOCs, and other household smells. For optimal performance, replace the filter every 12 months, depending on usage frequency and environmental conditions. Installation is simple and tool-free. Color: White Material: Plastic Package Contents: 1 x Filter (only; other items not included) Note: Color may vary slightly due to lighting and display settings. Measurement error allowed within +/- 1-3 cm.