Compare with Core 400S Filter Replacement compatible with Core 400S and 400S-RF purifiers. Designed to fit your purifier model. Why choose this filter? Offers precise sizing, high quality, low noise operation, and the same filtration technology at a lower cost. This replacement filter is a reliable and worthwhile investment for your air purifier. How does the filter work? Features an H13 True HEPA filter, activated carbon filter, and nylon pre-filter. Effectively captures 99.97% of particles as small as 0.3 micrometers and helps reduce odors, VOCs, and other household smells. For best performance: Replace the filter every 12 months, depending on usage and air quality conditions. Simple installation with no tools required. Color: White Material: Plastic Package Contents: 1 x Filter Unit Note: Light and screen display settings may cause slight color variations between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.