Compatible with Core 400S filter replacement for Core 400S and 400S-RF purifiers. Designed to fit your purifier precisely. Why choose this filter? Offers precise sizing, high quality, low noise operation, and the same advanced filtration technology at a lower cost. This replacement filter is a smart and reliable investment for your air purification needs. The replacement filter features an H13 True HEPA filter, activated carbon filter, and nylon pre-filter. Effectively captures 99.97% of particles as small as 0.3 microns and helps reduce odors, VOCs, and household smells. For optimal performance, replace the filter every 12 months, depending on usage and air quality. Simple installation with no tools required. Color: White Material: Plastic Package Contents: 1 x Filter Note: The actual product may vary slightly in color due to lighting and monitor display differences. Measurement error is allowed within +/- 1-3 cm.