Air filtration is a key element in controlling the number and the size of particles permitted per volume of air in a cleanroom. As we know, the class of the cleanroom is defined by the level of impurities taken out of the air by the filter medium, and there are several filter media available on the market for this purpose. Glass fibre, polyester felt or PTFE, all of them can be used for HEPA or ULPA class cleanrooms. The main difference between these materials is the filtration process itself. The filtration with glass fibre or polyester felt media is done within the material. With PTFE filter media, the filtration occurs on the surface and that leads to several advantages; high efficiency with a low-pressure drop and higher energy efficiency and smaller filters.
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