Philips Nano Protect Filter (FY1410/30) Features and Specifications Intelligent purification Captures 99.97% of particles As long as 24 months lifetime Philips NanoProtect HEPA Series 3 filter has 111 optimized pleats. This covers an unfolded area of about 1.6m2 to ensure a long lifetime up to 24 months. Captures 99.97% of particles Philips NanoProtect HEPA Series 3 filter is made of high quality material. It can capture up to 99.97%* of particles even as small as 0.3 microns the size of most common airborne allergens, harmful particles, bacteria and viruses.