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The assigned protection factor according to ANSI

T J Nelson1

  • 1NIHS Inc., Ardentown, DE 19810, USA.

American Industrial Hygiene Association Journal
|August 1, 1996
PubMed
Summary
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The American National Standards Institute (ANSI) assigned protection factors (APFs) for respirators based on available workplace and laboratory studies. While the database was limited, the assigned APFs remain supported by subsequent research.

Area of Science:

  • Occupational Health and Safety
  • Industrial Hygiene
  • Respiratory Protection Standards

Background:

  • The American National Standards Institute (ANSI) Z88.2 1992 standard establishes Assigned Protection Factors (APFs) for respiratory protection devices.
  • APFs are determined based on a review of available respirator performance studies, prioritizing workplace data when possible.

Purpose of the Study:

  • To evaluate the basis for the Assigned Protection Factors (APFs) established by the ANSI Z88.2 1992 standard for respiratory protection.
  • To understand the types and sources of data used by the ANSI committee in determining APFs for various respirator types.

Main Methods:

  • Review of the studies cited by the ANSI committee for APF determination.
  • Analysis of the types of studies (workplace vs. laboratory) used for different respirator categories.

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  • Assessment of the limitations of the available data, including the availability and publication status of studies.

    • Main Results:

    • Workplace studies were foundational for half-mask air-purifying respirators and loose-fitting facepiece powered air-purifying respirators (PAPRs).
    • For full-face air-purifying, helmet/hooded PAPRs, and most supplied-air respirators, APFs relied on laboratory studies or analogies due to a lack of workplace data.
    • Limited and often unpublished studies comprised the database available to the ANSI committee.

    Conclusions:

    • The ANSI committee performed a critical review of available data, including unpublished studies.
    • Subsequent research completed after the standard's development continues to validate the assigned APFs.
    • The methodology for assigning APFs was constrained by the limited database available at the time.