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* First, the pre-filter blocks larger particles, such as hairs, animal dander and house dust allergens. * Second, the finer particles that have passed through the pre-filter, including bacteria and viruses, are charged by the Corona field charger. * Third, the Electro-Static Precipitation (ESP) filter attracts these charges particles to its surface and keeps them safely trapped. The 2-stage Fresh air filtration system uses advanced Nano-Confined Catalytic Oxidization (NCCO) technology. Firstly,