Certified Levoit Replacement Filter: Only use genuine Levoit LV-H135 tower replacement filters to keep your LV-H135 air purifier at its best working condition and capacity 3 Stage Filtration System: Fine Preliminary Filter, True HEPA Filter & Activated Carbon Filter. Air intake from all sides increases its efficiency and captures 99. 97% of dust, dander, odors, allergens, and more 360 Degree Air Purification: With the special four directions air inlet, this filter has an all-around performance in cleaning poor air in every corner of your lovingly home, and never ignore of any odor, dust, pollen, and smoke, protecting the respiratory system of your families and you 100% Odorless: It will not release any strange smell. Only works to remove unwanted odor and particles. Perfect for those who are sensitive to the surrounding air or anyone who wants to improve the air quality Buy with Confidence: 100% satisfaction . If you need additional assistance, contact the helpful Levoit support. NOTE: It is recommended to replace the filters every 6-8 months. Remove the plastic package of the filter before placing them into the air purifier