3-Stage Filtration for Simply Clean Air. Includes a fabric pre-filter, activated carbon filter, and an H13 HEPA filter to capture large and fine particles, home odors, odors from pet, and VOCs. Medical-grade HEPA Filter. Captures 99.97% of particles 0.3 microns and smaller when on lowest fan speed, helping to remove airborne allergens and irritants like dust, pet dander, pollen, and smoke like that from wildfires, cooking, and smoking. Honeycomb-Structured Carbon Filter. Filter contains thousands of activated carbon pellets engineered to capture gases, volatile organic compounds (VOCs) and common household odors including odors from pets, cooking and smoke. Large Room Coverage and AHAM Certified. Filters 1582 sq. ft. with 1 air change/hour. Filters 791 sq. ft. with 2 air changes/hour. Filters 527 sq. ft. with 3 air changes/hour. Filters rooms 327 sq. ft. providing 4.8 air changes/hour. Low Energy and Library Quiet. Energy Star rated and equipped with 5 fan speeds the lowest of which is as quiet as a library. Automated CirQulate System. PM 2.5 particle sensor monitors and provides color-coded, indoor air quality readings and adjusts to the appropriate fan speed for continuous clean air. Commercial-Grade Performance. Brushless, digital DC motor and powerful XL fan pulls air in through the front of the air purifier and the 3 filters, releasing clean air out of the top vent.