Sumbelive D360 True HEPA Replacement Filter For Winix Air Purifier, 2-Pack + 8 Carbon Pre-Filters, Item# 1712-0101-02

We suggest you replace it every 3-6 months (depends on the use time and frequency). 【Activated Carbon Filter】Activated carbon filter absorb gases and unpleasant odors. It is the most important part of the filtration process. 【Efficient Filter】With honeycomb structure, capable offiltrate 99.97% of the 0.03um particles. When the filterelement cannot filter smoke and offensive gas, please replace it. 【Pre-Filter】Captures larger visible particles such as accumulated dust. When the surface of the filter element is covered with dirt that cannot be cleaned and its area ex-ceeds 70%, please replace the filter elements.