Featured 3-Stage filtration system comprising Charcoal Foam Pre-filter, true HEPA filter, and Activated Carbon filter. Strong enough to remove 99.9% of cigar smoke/smell, dust, pet dander, pollen, lint, mold, microbes, VOCs, cooking odor, litter box smell, tackle particles down to 0.3 microns . Effective area up to 161 ft²/15 m², it can clean 50 cubit feet air per minute in normal mode, especially suitable for small room, office, bedroom, living room, etc.