CDC logoSafer Healthier People CDC HomeCDC SearchCDC Health Topics A-Z
NIOSH - National Institute for Occupational Safety and Health

Skip navigation links Search NIOSH  |  NIOSH Home  |  NIOSH Topics  |  Site Index  |  Databases and Information Resources  |  NIOSH Products  |  Contact Us

Frequency of Fit Testing - FY08


  • 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 reviewer's comments
  • Q3 Obtain HSRB review and approval for the lab study protocol
  • Q4 Start data collection according to the approved lab study protocol


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


  • Improved respiratory protection for workers as a result of assessing fit characteristic changes through testing
  • Project data is used by NIOSH, CDC, OSHA, ISO, and ANSI in guidance documents, standards, or regulations
Page last updated: August 08, 2008
Page last reviewed: August 08, 2008
Content Source: National Institute for Occupational Safety and Health (NIOSH)