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Distribution of Faceseal Leak Sites on Half-Mask Respirators and Their Association with Facial Dimensions.

PB90162371

Publication Date	1990
Personal Author	Oestenstad, R. K.; Dillon, H. K.; Perkins, L. L.
Page Count	32
Abstract	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% of all observed leaks occurred at the nose or were multiple leaks which included the nose. About 73% 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% 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% of the subjects.
Keywords	Respirators Protective mask facepieces Leakage Anthropometry Fluorescence Aerosols Face(Anatomy) Performance Air flow Males Females
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95E - Life Support Systems
Corporate Authors	Alabama Univ. in Birmingham. School of Public Health.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also PB90-162389 and PB90-162397. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199009

Distribution of Faceseal Leak Sites on Half-Mask Respirators and Their Association with Facial Dimensions.

Distribution of Faceseal Leak Sites on Half-Mask Respirators and Their Association with Facial Dimensions.
PB90162371

Publication Date	1990
Personal Author	Oestenstad, R. K.; Dillon, H. K.; Perkins, L. L.
Page Count	32
Abstract	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% of all observed leaks occurred at the nose or were multiple leaks which included the nose. About 73% 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% 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% of the subjects.
Keywords	Respirators Protective mask facepieces Leakage Anthropometry Fluorescence Aerosols Face(Anatomy) Performance Air flow Males Females
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	95E - Life Support Systems
Corporate Authors	Alabama Univ. in Birmingham. School of Public Health.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes	See also PB90-162389 and PB90-162397. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199009