Others Others Philips Nano Protect filter FY0194 / 30 series 2 The NanoProtect Series 2 filter captures 99.5% of 0.003um particles, including common allergens, dust, contamination, and bacteria. Thanks to a 12-month shelf life, it offers long-lasting performance. Smart purification. Captures 99.5% of the particles. Shelf life of up to 12 months. The Philips NanoProtect Series 2 filter covers an area of approximately 1.26 m to ensure a long service life of up to 12 months. Captures 99.5% of the particles. The Philips NanoProtect Series 3 HEPA filter is made of high-quality materials. It can capture up to 99.5% of particles even as small as 0.003 microns (the size of the most common airborne allergens, harmful particles and bacteria *). The high-quality filter with firm and stable structure ensures that all air passes through the filter and provides highly efficient filtration.