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The particle filter is made of polypropylene, which mechanically filters out airborne particles. To maximize filter effectiveness, particles are negatively charged before reaching the filters. For optimal performance Blueair recommends that you replace filters every six months. We offer a convenient Filter Subscription Program (not available in all countries). For information or to place an order, contact your local dealer or Blueair. IMPORTANT! Use only Blueair filters to ensure proper function