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A particle size selective dilution system
In this contribution we describe and characterize a particle size selective dilution (PSSDS) system that can be hooked up to various types of aerosol generators. The system is based on the principle of virtual impaction. It dilutes the small particle fraction of the aerosol produced by the generator while it leaves the coarse fraction unchanged. The system allows to rapidly switch between the modified and the unmodified size distribution of the original aerosol. A useful application of the PSSDS in the field of filter tests is presented.