The original Philips filter to ensure the best performance of your air purifier. Designed together with the device itself to ensure a perfect fit which guarantees continuously smooth operation. Up to 99.9% virus removal. The purifier captures aerosols including those which may contain respiratory viruses. Tested independently to remove up to 99.9% of viruses and aerosols from the air¹. The cylindrical 3 in 1 filter combines all three layers of filters, needed to achieve day-one filtration performance of your device. Active Carbon, HEPA and pre-filter are the optimal combination that remove pollutants, pollen, viruses, allergens and bacteria to make sure that you breathe cleaner air, as all three filters are changed at the same time. The NanoProtect HEPA technology not only captures pollutants, but it uses a special electrostatic charge to attract them, enabling it to purify the air faster than HEPA H13 filter that is medically used². Philips integrated 3-in-1 filter provides consistent protection and guarantees optimal filtration for up to 36 months³. Tested and certified for the quality you can trust. Philips air purifier filters go through a set of strict inspection tests before being released from factory. For optimal filtration performance, regularly vacuum-clean the pre-filter.