Oreck AirInstinct Medium Room HEPA Air Purifier 3 Year HEPA filter (Filter life will vary by usage and environment) captures 99.97% of dust, allergens, smoke, pet dander and pollen at .3 microns from the air that passes through the filter 1 Year Odor filter (Filter life will vary by usage and environment) reduces common household odors and VOCs from the air that passes through its filter Turn it on and walk away The AirInstinct combines a smart sensor, auto mode and colored indicator lights to check continuously the particle levels passing through its sensor and adjusts the air flow speed accordingly Suggested for living spaces up to 221 square feet and has a CADR of 143 4 speeds including auto mode, replace filter indicator lights, mood light, Energy Star Certified