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Human subject testing of leakage in a loose-fitting PAPR.

Authors
Johnson-AT; Koh-FC; Jamshidi-S; Rehak-TE
Source
J Occup Environ Hyg 2008 May; 5(5):325-329
NIOSHTIC No.
20033669
Abstract
Leakage from loose-fitting PAPRs (powered air-purifying respirators) can compromise the safety of wearers. The Martindale Centurion MAX multifunction PAPR is a loose-fitting PAPR that also incorporates head, eye, and ear protection. This respirator is used in mines where coal dust usually is controlled by ventilation systems. Should the respirator be depended on for significant respiratory protection? Ten human volunteers were asked to wear the Centurion MAX inside a fog-filled chamber. Their inhalation flow rates were measured with small pitot-tube flowmeters held inside their mouths. They were video imaged while they breathed deeply, and the points at which the fog reached their mouths were determined. Results showed that an average of 1.1 L could be inhaled before contaminated air reached the mouth. As long as the blower purges contamination from inside the face piece during exhalation, the 1.1 L acts as a buffer against contaminants leaked due to overbreathing of blower flow rate.
Keywords
Respirators; Respiratory-equipment; Respiratory-protective-equipment; Equipment-design; Equipment-reliability; Personal-protective-equipment; Protective-equipment; Testing-equipment
Contact
Arthur T. Johnson, University of Maryland, Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742
CODEN
JOEHA2
Publication Date
20080501
Document Type
Journal Article
Email Address
artjohns@umd.edu
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
1545-9624
NIOSH Division
NPPTL
Source Name
Journal of Occupational and Environmental Hygiene
State
PA; MD
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