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Total Inward Leakage (TIL) - FY08


  • Establish TIL testing capability and performance requirements for testing respirators for inclusion in 42 CFR Part 84.
Testing with Portacount

Applicable Standards

  • 42 CFR Part 84

Key Partners

  • Respirator Manufacturers



  • OSHA
  • Manufacturers
  • Employers
  • Labor Unions
  • Respirator Users

Project Scope

  • Establish TIL requirements for half-mask respirators
  • Establish TIL requirements for all respirator classes


  • 4Q - Submit proposed rule to NIOSH OD and begin rulemaking process


  • TIL performance requirements for testing and certification in 42 CFR Part 84
  • Final rule


  • PPE designs that result in better overall fitting respirators for general industrial workers, healthcare workers and emergency responders.
Page last updated: August 08, 2008
Page last reviewed: August 08, 2008
Content Source: National Institute for Occupational Safety and Health (NIOSH)