Our 211 + Filter Replacement compatible with 211+ Air Cleaner Purifier,This premium filter is made of non-woven fabric and activated carbon, and adopts advanced low-energy consumption and low-density structural technology to ensure the optimal balance between air purification and filtration efficiency, has a 2-layer filtering function. There are H13 true HEPA filter and activated carbon filter. The activated carbon filter can absorb unpleasant odors including cooking and smoke.The High Efficiency H13 true HEPA filter can capture 99.7% of suspended solids as small as 0.3 microns
We recommend replacing the filter for 211 replacement filter every 5-8 months for optimal performance.