Honeywell 50250-S True HEPA air purifiers are the best choice for capturing airborne allergens. In fact, surveys show that more doctors recommend Honeywell air purifiers to their patients than any other brand. It offers outstanding air cleaning performance with a HEPA filter. The True HEPA filter captures up to 99.97% of common airborne pollutants as small as 0.3 microns from the air passing through it such as dust, pollen, tobacco smoke, and pet dander. In addition, it also helps capture airborne viruses and bacteria.