The Philips FY5185/30 filter is made of high quality material. The filter removes up to 99.97% of extremely fine particles as small as 0.003 microns, including harmful nanoparticles, bacteria and viruses. All air flows through a high-class filter with a solid and stable structure that ensures high filtration efficiency. The filter has numerous optimized pleats, which ensure a long service life – up to 24 months. Fits the Philips AC5659 / 10 air purifier.