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Clean Room Fan Filter Units Sep 19, 2017 Static electricity in the filtration effect does not play a decisive role, only play a supplementary role. Chemical filtration Chemical filters are mainly selective adsorption of harmful gas molecules. There are a large number of invisible pores in the active carbon material, which has a larger adsorption area. The size of rice grains in the active carbon, micro-pore area of more than 10 square meters large. When the free molecule is contacted with activated carbon, it condenses into a liquid in the micropore because the capillary principle stays in the microporous, and some materials are integrated with the material.