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

Laboratory Tests for Total Inward Leakage - FY07

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


  • To strengthen scientific basis on which NIOSH recommendations for respiratory protection depend
  • Develop improved methods for measuring an actual exposure dose of Freon-113
  • To develop a validated respirator performance test for high APF respirators
Man in full PPE ensemble at T I L test chamber

Applicable Standards

  • 42 CFR84
  • 29 CFR 1910.134
  • ISO

Key Partners

  • Chris Coffey, NIOSH/DRDS
  • Karla Thrall, Karl Weitz, PNNL
  • Robin Howie, Howie Associates, Inc., UK


  • Respirator users
  • Respirator manufacturers
  • OSHA

Project Scope

  • Develop improved strategies and methods
  • Keeping Entech equipment and analytical instruments ready for data collection and analysis
  • Compare fit factors to Freon-113 exposure dose


  • Conduct subject characterization testing
  • Calculate correlation coefficients between exhaled breath Freon concentration and Freon exposure concentration
  • Conduct method comparison data collection


  • None for FY07


  • None for FY07
Woman Total Inward Leakage T I L test
Page last modified: July 23, 2007
Page last reviewed: July 23, 2007 (archived document)
Content Source: National Institute for Occupational Safety and Health (NIOSH)