Sensor technology monitors air quality, performance & filter life.  The pollution sensor lets you know whether the ambient air quality is Clean, Unclean or In Between.     5 advanced purification stages to remove nearly all pollutant types.     1. True, Cleanable HEPA Filter The most effective protection against dust, allergens and other solid particles including bacteria).2. Germicidal UV Lamp The most effective way to destroy micro- organisms such as germs, viruses, bacteria and fungi (such as mold toxins).3. Activated Carbon Filter The best type of air filter for trapping chemicals, gases, odors and cigarette smoke.4. Safe and Effective Ionizer Disperses trillions of negative ions to seek out and remove particles & bacteria from the air.5. Photocatalytic Oxidation (TiO2) Filter This filter is coated with titanium dioxide, which produces highly reactive ions and electrons when combined with the UV light from the IP3's UV lamps. These highly reactive ions attach to chemical molecules, bacteria and odor-causing compounds, destroying them through oxidation.Low Replacement Costs. Even with 5 purification stages, the IP3 replacement filters are quite low. The photocatalytic filter will typically last 3-5 years before needing to be replaced, and the HEPA filter is cleanable, extending its life and further reducing replacement costs. And unlike most UV air purifiers, there are no bulbs to replace either. The revolutionary UV mini-lamps of the IP3 will last more than five years if left to operate continuously, and longer than this if not run continuously.Powerful, yet quiet. The 180-cfm fan maximizes air exchanges, increasing air-filtration capacity. But with its brushless-DC motor, the IP3 runs smooth and quiet.     Effectively removes: dust, allergens, mold, micro-organisms, cigarette smoke, odors, chemicals, bacteria and much more.