The real difference is difficult to predict as it will vary with every aerosol distribution sampled. A recent publication by Bartley et al 5 and a pending one by Kenny et al 6 present data which makes it possible to sample over a wide range of cuts. In utilizing the information presented below, a number of factors must be borne in mind. All size cuts given are D 50 . All size cuts refer to aerodynamic equivalent diameter.
Some values given are outside the ranges tested and are extrapolated.
Both the Bartley 5 and Kenny 6 equations yield a D 50 of 4.37 micrometers, for the respirable cut rather than 4 micrometers. For the details of the equations, the original equations 5,6 should be consulted. For practical purposes, the following look up table is presented, as it applies to BGI-4CP, SKC Plastic, and Casella Cyclones, only. Particle Size Selective Sampling in the Workplace. Federal register vol.