Promotes a Healthy Breathing Environment Six stages of air purification create a complete air cleansing system for your home. Captures Airborne Allergens HEPA filter captures 99.97% of airborne particles such as household dust, pet dander, mold spores and plant pollens Destroys Odors Helps to remove smoke particles and odors from the air Whisper-Quiet Operation Optional speed settings allow for whisper-quiet As established by the United States EPA, in the last several years, a growing body of scientific evidence has indicated that the air within homes and other buildings can be more seriously polluted than the outdoor air in even the largest and most industrialized cities. Other research indicates that people spend approximately 90 percent of their time indoors. Thus, for many people, the risks to health may be greater due to exposure to air pollution indoors than outdoors. To help create a healthier indoor environment use the Germ Guardian™ Complete Air Cleansing System. It offers six stages of air purification to help clean the air in your home while destroying germs and odors. A dust sensor analyzes the air quality by detecting dust, smoke, pollens and small particles and automatically adjusts to provide an optimal level of purification. The six layers of air purification include: 1. Pre-filter- for larger particles like pet hair and lint 2. Charcoal filter- removes odors, including smoke 3. HEPA filter- captures 99.97% of allergens 4. PCO filter- destroys micro-organisms such as bacteria and mold 5. UV light tube works with the filters to kill germs 6. Ionizer- releases a small amount of negative ions to enhance the cleaning process. US Warranty: 1 year limited warranty on defects in materials and workmanship. Non-US Warranty: 30 days parts and labor