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Simplified pressure method for respirator fit testing.

D Han1, M Xu, S Foo

  • 1Department of Environmental Health, University of Cincinnati, OH 45267-0056.

American Industrial Hygiene Association Journal
|August 1, 1991
PubMed
Summary
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A simplified pressure method offers a quick way to fit test air-purifying respirators. This new method measures airflow through the respirator seal and compares it to cartridge airflow for an accurate fit assessment.

Area of Science:

  • Occupational Health and Safety
  • Respiratory Protection Technology

Background:

  • Fit testing is crucial for ensuring the effectiveness of air-purifying respirators (APRs).
  • Traditional fit testing methods can be time-consuming and complex.

Purpose of the Study:

  • To develop and validate a simplified pressure-based method for fit testing APRs.
  • To establish a reliable measure of respirator fit using airflow ratios.

Main Methods:

  • Developed a novel pressure method replacing cartridges with a pressure-sensing attachment and valve.
  • Measured steady-state pressure by briefly extracting air from the respirator cavity.
  • Determined the ratio of cartridge airflow to face seal leak airflow as a measure of fit.

Main Results:

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  • The pressure method achieved steady-state pressure in 1-2 seconds.
  • The flow ratio was found to be a reliable indicator of respirator fit.
  • Compared to photometric and particle count tests, aerosol tests yielded higher fit values.

Conclusions:

  • The simplified pressure method provides an efficient and accurate means for fit testing APRs.
  • This method offers a standardized approach to assessing respirator seal integrity.
  • Further validation against established methods confirms its potential for widespread adoption.