The Excel is a desktop portable electronic air purifier designed for home and office use. It will clean a 15' x 15' room up to four times per hour. The unit is available in several different colors. Using our powerful electronic filtering system, the air you breathe will be cleaner and healthier. The washable and reusable electronic filter cell removes up to 97% of particulate as small as 0.01 micron which includes allergy triggers such as pollens and animal dander. The Excel will also quietly remove cigarette and cooking smoke, dust, bacteria and many viruses.