Measuring Inhaled Contaminant Volumes in Respirators
Author Information
Author(s): Arthur T. Johnson, Frank C. Koh, William H. Scott Jr., Timothy E. Rehak
Primary Institution: University of Maryland
Hypothesis
How much contaminant can be expected to be inhaled when using different types of respirators?
Conclusion
The study found significant variability in the protection factors of different respirators, with some providing little to no protection and others offering high levels of protection.
Supporting Evidence
- The Racal AirMate loose-fitting PAPR had a wearer protection factor of 1.1, indicating poor protection.
- The 3M Hood and SE 400 PAPR showed infinite protection factors, suggesting they provided excellent protection.
- Blower effectiveness varied, with some respirators contributing to inhaled air even during exhalation.
Takeaway
This study looked at how well different masks keep bad air out. Some masks did a great job, while others let a lot of bad air in.
Methodology
The study used CO2 as a tracer gas to measure inhaled contaminant volumes and blower effectiveness in various respirators tested on a breathing machine.
Limitations
The study's results may not fully align with OSHA's assigned protection factors due to differences in measurement methods.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website