2pc Philips Nano Protect Series 3 Replacement Filter f/ Air Purifier/6000/6000i

Special layerd media provides the combination of specific filtration technology targeting large range of particle sizes. Mechanical & inertial means captures bigger particles, which are more than ~0,5 micron, and diffusion & electrostatic mechanism effectively captures ultra fine particles as small as 20nm.
Innovative structure & process to make the superior filter
87 optimized pleats structure together with German Hankel hot melt to form more than 400 stable filter sections, gives unfolded area about 2.3 m^3. High grade filter seal enabling the filter assembly firmly and guarantee the sealing, not only prevents leakage and ensure all air flows through filter, but also reduces noise.
Philips Air Purifier traps 99.97% of particles as small as 0.3 microns that pass through the filter. Tested on the filter media for 1 pass efficiency at 5.33cm/s airflow in 2015 by a third party lab
From air that passes through the filter. The filter was tested with NaCL test aerosol according to DIN71460-1 in IUTA.
Tested with Staphylococcus albus and Influenza A (H1N1).