The Honeywell Allergen Plus Series HEPA Air Purifier is used to reduce allergens and provide cleaner, fresher air in large rooms up to 1,700 sq. Ft.** HEPA filtration captures up to 99.97% of microscopic particles like dust, pollen, pet dander, dust-mite debris, and smoke*. The activated carbon pre-filter helps capture large airborne particles and reduces odors. If you have pets or stale indoor air, this model has an Air Quality Sensor that continuously monitors and adjusts air quality automatically. It also features InSight Display, which shows the 4 cleaning levels, air quality indicator, and Auto Mode setting. This quiet air purifier has an auto-off timer and dimmer option for control panel lights. Initial air purifier filters included: 2 HEPA R Filters, 1 Odor Reducing Pre-Filter A. Disclaimers: *From the air that passes through the filter, 0.3 microns and larger. **Based on 3rd party independent CADR testing for the smoke CADR value when operated at the highest level. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter.