Collection efficiency of respirator filters challenged with monodisperse latex aerosols.
Brosseau-LM; Evans-JS; Ellenbecker-MJ; Feldstein-ML
Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts; :1-24
An evaluation was made of the collection efficiency of electrostatically charged dust/mist respirator filters from ten manufacturers. Filters were challenged with eight sizes of latex spheres in a range which represents the silica (14808607) aerosol used in NIOSH certification tests. At or below the size of 0.102 micrometers, minimum efficiency was reported. Differences in the performance of the filters distributed by the ten manufacturers were noted. One manufacturer produced filters which were significantly lower in their collection efficiency than the other filters tested. Two manufacturers produced filters which were somewhat better than the other eight. By using a statistical evaluation of Weibull transformed data with analyses of covariance and Tukey's significant difference test it was possible to classify the filters into three performance groupings. Such filters were used in air purifying respirators designed for use in environments contaminated by moderately hazardous aerosols. The data collected not only served to assist in developing an empirical model, but also was helpful in the selection of a subset of filters for use in subsequent experiments.
NIOSH-Grant; Respirators; Personal-protective-equipment; Respiratory-protection; Dust-inhalation
Environmental Sci & Physiology Harvard School of Public Hlth 665 Huntington Avenue Boston, MA 02115
Final Grant Report
NTIS Accession No.
Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts
Harvard University, Boston, Massachusetts