This Blue 221 Model of air purifier cleans the entire volume of air in a 50m² room completely five times per hour and keeps it perfectly clean. Creating your personal safe haven, with air as clean as at the greatest outdoor locations on earth. If your room is smaller, the air gets cleaned, even faster and more often. The entire bottom half of this purifier consists of an advanced filter. Millions of ultra-thin fibers of different layers make it less dense than ordinary filters, resulting in less clogging, higher airflow, and lower noise. Using both mechanical and electrostatic filtration, the filter catches virtually every airborne contaminant down to a virus in size: pollen, dust, pet dander, mold spores, smoke, allergens, and bacteria. When you finally have to replace the filter, you don’t have to be an engineer, all you need is two index fingers and one click. The pre-filter catches larger particles, extending the life of the main filter. Just gently vacuum it or put it in your washing machine when it requires cleaning.