The NanoProtect HEPA filter protects you from viruses, bacteria, pollens, dust, PM2.5 and pet dander. This filter uses advanced NanoProtect technology to ensure a high level of filtration. It is designed to be compatible with specific Philips air purifiers, providing efficient and reliable air purification. The filter is easy to install and replace, ensuring continuous clean air delivery. Regular replacement of the filter is recommended for optimal performance and air quality.