Designed to maximize the removal of airborne particles and allergy and asthma triggers, the Classic 200 Series Replacement Particle Filter is compatible with the following models; 203, 205, and 280i. Blueair filters use advanced HEPASilent? technology to rapidly remove 99.97% of airborne pollutants such as PM 2.5, pollen, dust, pet dander, mold spores, viruses, bacteria, microplastics, and more. This filter is recyclable and naturally antibacterial, so the only thing you’re adding back into the environment is clean air. For optimal performance, replace the filter about once every 6 months. Please check local your recycling facilities for availability.