This particle filter change kit fits the Blueair 400 Series and includes 1 standard HEPASilent filter of polypropylene (traps particles).
Blueair HEPASilent 400 Series Air Purifiers: 401, 402, 403, 450E.
Replace every 6 months
Easy Maintenance: When the filter needs to be replaced (twice yearly), just open the side, slide out the old filter and drop the new one in. No screws, hooks or tools and less than one minute of your time are required.
Fine polypropylene fibers effectively capture up to 99.97% of airborne particles. The Blueair 3-stage progressive filter effectively removes every type of particulate air pollutant including allergens, pollen, mold spores, dust, pet dander, bacteria, and viruses.