A new sampling technique that allows quantitative fit testing by using the employee's own respirator

Area of Science:

• Occupational Health and Safety
• Respiratory Protection
• Industrial Hygiene

Background:

• Quantitative respirator fit testing is crucial for ensuring effective respiratory protection.
• Current methods often require permanently modified (probed) respirators, which can be inconvenient and costly.
• There is a need for non-invasive, adaptable fit testing techniques.

Purpose of the Study:

• To develop and evaluate a new, in-mask sampling technique for quantitative respirator fit testing.
• To eliminate the necessity of using a permanently modified respirator for fit testing.
• To assess the equivalence of the new technique compared to conventional methods.

Main Methods:

• A novel sampling adapter was designed for temporary attachment between the air-purifying filter and facepiece.
• The adapter was engineered to maintain the respirator's original functional performance.
• Human test subjects underwent simultaneous sampling using the new method and a conventional probed respirator with two quantitative fit test instruments.

Main Results:

• The new in-mask sampling technique successfully collected samples from the breathing zone inside the respirator.
• Simultaneous sampling demonstrated equivalent fit test data between the new method and the conventional probed respirator.
• The temporary sampling adapter did not alter the overall performance of the respirator.

Conclusions:

• The developed in-mask sampling technique provides a viable, non-invasive alternative for quantitative respirator fit testing.
• This method enhances the practicality of fit testing by removing the need for modified respirators.
• The findings support the adoption of this technique for improved occupational safety and respiratory protection programs.