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Penetration of fiber versus spherical particles through filter media and faceseal leakage of N95 filtering facepiece respirators with cyclic flow.

Authors
Cho-KJ; Turkevich-L; Miller-M; McKay-R; Grinshpun-SA; Ha-K; Reponen-T
Source
J Occup Environ Hyg 2013 Mar; 10(3):109-115
NIOSHTIC No.
20041894
Abstract
This study investigated differences in penetration between fibers and spherical particles through faceseal leakage of an N95 filtering facepiece respirator. Three cyclic breathing flows were generated corresponding to mean inspiratory flow rates (MIF) of 15, 30, and 85 L/min. Fibers had a mean diameter of 1 um and a median length of 4.9 um (calculated aerodynamic diameter, d(ae) = 1.73 um). Monodisperse polystyrene spheres with a mean physical diameter of 1.01 um (PSI) and 1.54 um (PSII) were used for comparison (calculated d(ae) = 1.05 and 1.58 um, respectively). Two optical particle counters simultaneously determined concentrations inside and outside the respirator. Geometric means (GMs) for filter penetration of the fibers were 0.06, 0.09, and 0.08% at MIF of 15, 30, and 85 L/min, respectively. Corresponding values for PSI were 0.07, 0.12, and 0.12%. GMs for faceseal penetration of fibers were 0.40, 0.14, and 0.09% at MIF of 15, 30, and 85 L/min, respectively. Corresponding values for PSI were 0.96, 0.41, and 0.17%. Faceseal penetration decreased with increased breathing rate for both types of particles (p
Keywords
Respirators; Respiratory-protective-equipment; Personal-protective-equipment; Face-masks; Failure-analysis; Filters; Filtration; Equipment-design; Equipment-reliability; Fibrous-bodies; Fibrous-dusts; Particulate-dust; Particulates; Air-filters; Air-flow; Air-purifying-respirators; Breathing; Particle-aerodynamics; Author Keywords: particle shape; protection factor; total inward leakage
Contact
Tiina Reponen, University of Cincinnati, Department of Environmental Health, P.O. Box 670056, Cincinnati, OH 45267
CODEN
JOEHA2
CAS No.
100-42-5
Publication Date
20130301
Document Type
Journal Article
Email Address
tiina.reponen@uc.edu
Funding Type
Grant
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-004085; B20121218D
Issue of Publication
3
ISSN
1545-9624
NIOSH Division
DART
Priority Area
Manufacturing; Mining
Source Name
Journal of Occupational and Environmental Hygiene
State
OH
Performing Organization
University of Cincinnati
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