#1 brand recommended by allergists1 Certified HEPA captures up to 99.97% of microscopic particles, 0.3 microns and larger - Also reduces up to 99.9% of certain bacteria, mold spores and viruses. Insight Display provides valuable information like settings and air quality at-a-glance from a distance Helps reduce odors and VOC's. 4 Air Quality Indicator and Auto Mode Touch Screen LED Control Panel, 4 Intuitive Cleaning Levels (3 + Turbo), Auto-off timer, Control panel dimmer & Filter change indicators 5 room air changes per hour 5 AHAM CADR (smoke): 323 / Rm Size: 500 sq. ft.