SKU: FY3433-10 Philips Nano Protect Filter HEPA Series 3 for Air Purifier Cleaning captures 99.97% 0.3m particles, including common allergens, dust, pollution, bacteria & some virus. It has multiple optimized pleats and covers an unfolded area of about 2m2 to ensure a long lifetime. 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. The high-grade filter with firm and stable structure ensures all the air flows through the filter and delivers high filtration efficiency.