This particle filter change kit fits the Blueair 500/600 Series and includes 3 standard HEPASilent filters of polypropylene (traps particles), which is enough for one complete filter change.
Blueair HEPASilent 500/600 Series Air Purifiers: 501, 503, 550E, 601, 603, 650E.
Replace every 6 months
Easy Maintenance: When the filters need to be replaced (twice yearly), just open the side, slide out the old filters and drop the new ones 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.