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Frequency of Fit Testing - FY09

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.

Current Information can be found at: Frequency of Fit Testing - FY10


  • The specific aims of this project are to:

    • Assess the rate at which respirator fit changes as a function of time for a representative sample of subjects wearing filtering-facepiece respirators (FFR); and
    • Investigate the factors that affect such change

Applicable Standards

  • 29 CFR 1910.134
  • ISO TC94 SC 15

Key Partners

  • None


  • OSHA
  • MSHA
  • ANSI
  • AIHA
  • ISO
  • Respirator Users
Man testing respirator with Portacount

Project Scope

  • A laboratory study will be conducted to assess causative factors affecting temporal changes in respirator fit. The possible causative factors include: weight gain or loss, face size change, 3-D scans and nose shape change, wrinkling and scarring, medical procedures, BMI, percent body fat, height, age and gender.


  • Q1 Complete revision of the protocol per HSRB review comments and Start data collection for the pilot study.
  • Q2 Start data collection for the initial testing and Complete data collection for the pilot study.
  • Q3 Complete data collection for the 110 subjects and Conduct statistical analyses of the first pilot study.
  • Q4 Complete initial testing for all 220 subjects and Draft a manuscript based on the first pilot study data.


  • Manuscripts published or submitted to peer review journals
  • Presentations to stakeholders or conferences
  • Standards committee meetings & public meetings


  • Project data is used by NIOSH, CDC, OSHA, ISO, and ANSI in guidance documents, standards, or regulations
Page last updated: April 05, 2010
Page last reviewed: April 14, 2009
Content Source: National Institute for Occupational Safety and Health (NIOSH)
National Personal Protective Technology Laboratory