The Five Seasons High Efficiency Top Loading Air Purifier has been designed to remove atmospheric and household dust, coal dust, insecticide dust, mites, pollen, mold spores, fungus, bacteria, pet dander, kitchen smoke and grease, tobacco smoke particles and more up to 0 .3 micron (1/84,000 inch). Ideal for homes with allergies, asthma or respiratory patients, smokers, pets and asthmatics. Helps protect and extend the efficiency of heating and cooling equipment.