Preliminary evaluation of the effectiveness of respiratory filters in a grain elevator.
Kennedy ER; Reed LD; Johnston OE; Lockwood WT
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, 1979 Feb; :1-20
The effectiveness of respiratory filters used in grain elevators was studied. Six types of commercially available dust and mist respirators were tested in a grain elevator environment for 3 hours. The percent of particulate penetration, particulate size, and loading effects were determined. Grain dust concentrations were found to be very low while the average particle size was quite large averaging 3 to 7 micrometers. Penetrations were well below 10 percent for all the tests. A correlation between percent penetration of respirator filters and grain dust concentration demonstrated a loading effect on the filter. The authors conclude that respirator filter effectiveness exceeding 95 percent provides adequate protection, but suggest that further tests involving other types of grain dust and higher concentrations be conducted.
Grain-elevators; Grain-dusts; Dust-analysis; Respirable-dust; Respiratory-protection; Respiratory-protective-equipment; Dust-masks; Filter-materials
National Institute for Occupational Safety and Health