Respirator Performance Model for Particulates.
Department of Environmental Health Sciences, Center for Occupational and Environmental Health, UCLA School of Public Health, Los Angeles, California 1992 Nov:12 pages
The effect of particle size distribution on the performance of representative single use, half mask, and full face respirators was investigated. An experimental set up was developed to measure respirator and leak penetration as a function of particle size and flow rate through the respirator. Detailed studies were performed of respirator filter performance. Measurements were made of particles penetrating the facial seal leaks. A predictive model was developed using these data which can be used to determine the performance of half mask respirators for protection against aerosols. An evaluation was performed of the leakage of normal and impaired exhalation valves during inhalation. Model validation measurements were performed for respirator filters as they became filled with dust. The penetration characteristics of facial seal leaks for full face masks were evaluated. The authors conclude that it is possible to model the performance of respirators with enough precision to provide useful insight into the protection being offered by half mask respirators. Dust accumulating on the respirator increases the resistance of air flow through the filters and increases the collection efficiency of the filters. Respirator filter performance varied significantly between types and between brands within a type.
NIOSH-Grant; Respirators; Personal-protective-equipment; Respiratory-protection; Equipment-reliability; Face-masks;
Environ and Nutritional Scis University of California 405 Hilgard Avenue Los Angeles, Calif 90024
Final Grant Report;
NTIS Accession No.
Department of Environmental Health Sciences, Center for Occupational and Environmental Health, UCLA School of Public Health, Los Angeles, California
University of California Los Angeles, Los Angeles, California