Air Purifier Replacement Filters 4 Pack Compatible with 25 Series Air...

Compatible Models: Replacement Filter Compatible with 25 Air Purifier S1/W1/B1 3 Layer Filtration: Our 25 replacement filter has a 3-layer filtering function. They are fine pre-filter, H13 true HEPA filter and activated carbon filter. The activated carbon filter can absorb unpleasant odors including cooking and smoke High Efficiency: The H13 true HEPA filter can capture 99.7% of suspended solids as small as 0.3 microns High Quality: The 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 Please Note: We recommend replacing the 25 replacement filter every 5-8 months for optimal performance