Reduces Allergens, Dust & Odors, 2-Filter Design with Pre-Filter & HEPA G, Removes up to 99.97% of Particulates, Handles 0.3 Micron or Larger Particles, 4.8 Air Changes per Hour in 90 ft², Fan Intake with Silent Operation, 3 Different Cleaning Levels, Filter Check/Reset Light, Meets ENERGY STAR Guidelines. Ideally suited for smaller rooms in your home such as a nursery or home office you can measurably improve air quality with this HPA020B True HEPA Portable Tabletop Air Purifier from Honeywell. It features a mechanical filtration process which uses a fan to pull air in and move it through pre- and HEPA G filters. The pre-filter captures large particles including dust lint fibers and fur while also reducing odors and VOCs. Finer particles down to 0.3 microns and larger including dust pollen pet dander and smoke are captured by the HEPA G filter.