• J Environ Public Health · Jan 2011

    Comparative Study

    Inward leakage in tight-fitting PAPRs.

    • Frank C Koh, Arthur T Johnson, and Timothy E Rehak.
    • Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA.
    • J Environ Public Health. 2011 Jan 1; 2011: 473143.

    AbstractA 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.

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