Definition & Operational Usage
A facepiece positive pressure system is a feature integrated into self-contained breathing apparatus (SCBA) facepieces that maintains a slightly higher internal pressure than the surrounding atmosphere. This prevents contaminants from entering the mask during inhalation by ensuring any leaks push air outward. Not to be confused with the pressure demand regulator, this system enhances respiratory protection in hazardous environments such as fireground operations and hazardous materials incidents. It is critical in maintaining an effective seal during rapid intervention team (RIT) activities and PASS device alarms.
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Category context: PPE, SCBA, apparatus components, hose, nozzles, tools, and operational equipment terminology.
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