1.[ ]LV-H133 H13 True HEPA filter replacement only compatible with LEVOIT LV-H133 Air Purifier 2.[- ]The 360° 3-in-1 LV-H133 True HEPA and Activated Carbon Replacement Filter has an outstanding performance in filtration. Pre-filter catchs large particles and prolongs the life of the filter. The true HEPA filter captures small particles. The activated carbon filter effectively eliminates household odors such as smoke 3.[ ]Our LV-H133 filter fit for LEVOIT the superior performance and perfect fit for anyone looking for the comfort of fresh, clean and y air.Manufacturer tested materials allow our filters to last longer and perform better. Solve the troubles of poor air quality in your living space 4.[ & ]To maintain optimum performance of the air purifier.We recommend replacing the LV-H133-RF filter every 6-8 months (depending on air quality and usage).It is also very convenient to replace, please be careful not to forget to cut off the power before replacing