By using deposition of a fluorescent tracer aerosol during a standard quantitative fit test, faceseal leaks on one brand of half mask respirator worn by 73 human subjects were identified. The leaks were categorized according to their facial location and shape. The distributions of those categories were determined and the association of anthropometric facial dimensions with leak sites were tested. It was found that about 79 percent of all observed leaks occurred at the nose or were multiple leaks which included the nose. About 73 percent of all leaks approximated the shape of a slit rather than a round orifice. Males were much more likely to have slit like leaks than females. Significant associations were found for 25 percent of the tests between facial dimensions and leak site subsets. Only two significant associations were found for the facial dimensions used to define the Los Alamos respirator test panel. Gender was a factor in many of the significant associations. The amount of leakage through the chin area was higher than leaks at other sites. Significant correlation of facial dimensions and fit factor was found for three facial dimensions, none of which are used to define the respirator test panel. Evidence of air flow streamlining within the facepiece was noted on 22 percent of the subjects.
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