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Temporal changes in filtering-facepiece respirator fit.

Ziqing Zhuang1, Michael Bergman1, Elizabeth Brochu1

  • 1a National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory , Pittsburgh , Pennsylvania.

Journal of Occupational and Environmental Hygiene
|November 19, 2015
PubMed
Summary

Annual fit testing for N95 filtering-facepiece respirators (FFRs) is crucial. Significant weight loss, over 20 lb, necessitates re-testing to ensure proper respirator fit and seal.

Keywords:
Fit changeN95 filtering facepiece respiratorfit testfrequency of fit testrespirators

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Area of Science:

  • Occupational Health and Safety
  • Respiratory Protection
  • Industrial Hygiene

Background:

  • N95 filtering-facepiece respirators (FFRs) are critical personal protective equipment.
  • Maintaining a proper seal is essential for effective respiratory protection.
  • Changes in facial characteristics, such as weight fluctuations, can impact respirator fit.

Purpose of the Study:

  • To evaluate changes in N95 FFR fit over time.
  • To determine the relationship between weight changes and respirator fit.
  • To assess the adequacy of current respirator fit-testing schedules.

Main Methods:

  • A three-year longitudinal study involving 229 subjects.
  • Six-month intervals for fit testing of N95 FFRs.
  • Measurement of inward leakage and filter penetration to assess face seal leakage (FSL).

Main Results:

  • Unacceptable N95 FFR fit increased from 10% at Year 1 to 25% by Year 3.
  • Subjects experiencing a weight loss of 20 lb or more had a 24% rate of unacceptable fit.
  • Respirator fit degradation was linked to time intervals between tests and significant weight loss.

Conclusions:

  • Current annual fit testing requirements are supported by the study findings.
  • Significant weight loss (≥ 20 lb) is a key indicator for mandatory respirator re-testing.
  • Regular fit assessment is vital for ensuring the continued effectiveness of N95 FFRs in occupational settings.