HEPA+ Filtration: Layered 2-in-1 Bamboo-Charcoal/HEPA filter uses long grain activated charcoal to remove harmful VOCs and odors as HEPA filtration media captures up to 99% of airborne particles as small as 0.3 microns, including dust, pollen, smoke, and other allergens.ViRo-Silver Pre-filter: Initial layer of filtration where activated carbon absorbs unpleasant odors and VOCs, unique technology prevent up to 99% of bacterial growth within the filtration media.Powerful Air Cleaning: easy to use three-speed motor to quickly and efficiently clean the air, suitable for medium rooms. For best results pre-filter should be changed every 3 months and HEPA+ filter changed every 12-18 months depending on usage and conditions.Thoughtful design: three-speed manual control with filter change indicators, small footprint fits neatly in any room, built-in handle and wraparound cord storage.Three Year Limited Warranty.