Winix air purifiers are the only air purifiers available anywhere to offer PlasmaWave and Sanitized technologies which, combined with True HEPA filtration, give you the cleanest air you can make yourself * Energy Star Qualified, AHAM Certified, UL Approved, 1-Year Warranty * Air Quality Sensor detects the real conditions of the environment and automatically adjusts the unit"s performance so, unlike other brands which simply use a timer, the Winix brand air cleaner tells you to replace the filter when you really NEED to replace the filter: neither too soon (costing you money) nor to late (working ineffectively). Avg. filter life is 12 months * True HEPA Filtration captures 99.97% of airborne pollutants, pet dander and allergens as small as 0.3 microns. * PlasmaWaveTM Technology attacks pollutants at a molecular level to neutralize viruses, bacteria, chemical vapors, odors, and gases in the air - without producing ozone