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 Figure 2i. GK2.69 cyclone. This cyclone was designed to match the slope of the thoracic and respirable conventions more closely than other sampling cyclones. Cyclone construction is stainless steel and operates at 4.2 L/min as a respirable sampler and 1.6 L/min as a thoracic sampler.

Figure 2j. Personal cascade impactor sampler (model Marple 290, Thermo Andersen, Atlanta). The sampler has five stages in the version shown and an additional three stages are available to provide cutpoints from 0.4 :m to 21:m. The flap over the inlet reduces direct projection of large particles into the inlet. This sampler allows measurement of aerosol size distribution and calculation of respirable and thoracic fractions. Aluminum construction and operates at 1.7 L/min.

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NIOSH Manual of Analytical Methods