Inward Leakage in Tight-Fitting PAPRs

A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head fo...

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Bibliographic Details
Published in:Journal of Environmental and Public Health 2011-01, Vol.2011 (2011), p.121-128
Main Authors: Koh, Frank C., Johnson, Arthur T., Rehak, Timothy E.
Format: Article
Language:English
Subjects:
Aerosols - analysis
Air Pollutants, Occupational - analysis
Equipment Design - instrumentation
Equipment Design - methods
Filtration - instrumentation
Filtration - methods
Flow velocity
Humans
Life sciences
Occupational Exposure - analysis
Occupational safety
Regression analysis
Respiration
Respiratory Protective Devices - classification
Respiratory Protective Devices - standards
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Summary:A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.
ISSN:1687-9805
1687-9813
DOI:10.1155/2011/473143