Combination filter. Compatibility: Philips Air Purifier 800 series. Contents: 1 piece. Captures 99.5% of ultrafine particles down to 0.003 µm and removes allergens such as pollen, dust, dust mites, and pet dander. The activated carbon layer effectively absorbs odors and volatile organic compounds, including benzene and toluene. The 3-layer filtration with NanoProtect HEPA, activated carbon, and pre-filter ensures protection against bacteria, pollen, dust, fine particulate matter smaller than 2.5 µm, animal skin particles, and gases. Outstanding performance. The NanoProtect HEPA technology not only captures pollutants but also attracts them through a special electrostatic charge. This results in faster air purification than with a medically used HEPA H13 filter.