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Sweat rate inside a full-facepiece respirator
A T Johnson1, W H Scott, K M Coyne
1Biological Resources Engineering Department, University of Maryland, College Park 20742-5711, USA.
American Industrial Hygiene Association Journal
|January 13, 1998
Summary
Sweat accumulation inside full-facepiece respirators and increased facial skin temperature reduce comfort. This study quantified sweat rates, finding significant accumulation potential over an 8-hour workday.
Area of Science:
- Environmental Health
- Occupational Safety
- Human Physiology
Background:
- Respirator acceptability is crucial for worker safety, especially in hot environments.
- Sweat accumulation and facial temperature increase are key factors affecting respirator comfort.
- Current respirator designs do not effectively manage internal moisture and heat.
Purpose of the Study:
- To quantify sweat accumulation within full-facepiece respirators under heat stress.
- To assess the impact of sweat and temperature on respirator wearer comfort.
- To inform the development of improved respirator designs for hot conditions.
Main Methods:
- Twenty subjects were exposed to a hot, humid environment (35°C, 90% RH) for 90 minutes.
- Sweat production rates from the face, head, and neck were measured.
- Facial skin temperature changes were monitored throughout the exposure period.
Main Results:
- Average sweat rate was approximately 0.203 g/min, primarily from the neck.
- Men exhibited higher sweating rates than women.
- Facial skin temperature increased by an average of 2°C, correlating with discomfort.
Conclusions:
- Significant sweat accumulation can occur in full-facepiece respirators during prolonged wear.
- Elevated facial skin temperature due to trapped heat and moisture contributes to discomfort.
- Respirator design modifications are needed to mitigate heat and moisture buildup for improved wearer acceptance.