1. Permanent washable filter, no need to change;
2. High efficiency, particle capture 0.3 microns efficiency up to 99.99%;
3. Low windage, only 10-50 pascals pressure drop VS. 150-350 pascals pressure drop of HEPA filter;
4. Low energy cost and noise level thanks to the low windage;
5. Low maintenance cost, no need to change the ifD filter, simply wash and dry it to restore/refresh its capability;
6. No ozone per the new technology of ifD filter, big advantage comparing with the traditional electrostatic air purifier.