First: Pre-filter
Prevents large suspended particles such as dust and fluff in the air.
Second: ESP module
Filtration of particulate matter ( Filter fineness smallest to PM 0.1)
Third: CF catalytic plate filter
Catalytically decomposing ozone generated by high-voltage static electricity and other VOCs such as formaldehyde etc. (O3+VOCs =H2O+CO2)
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