Designed to maximize the removal of airborne particles and allergy and asthma triggers the Classic 400 Series Replacement Particle Filter is compatible with the following models; 403 405 and 480i. Blueair filters use advanced HEPA Silent? 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.