Definition & Operational Usage
A positive pressure regulator is a component of a self-contained breathing apparatus (SCBA) that maintains a consistent, slightly higher pressure inside the facepiece compared to the ambient atmosphere. This positive pressure prevents contaminants from entering the mask during use in hazardous environments. Not to be confused with a pressure reducing regulator, which controls cylinder pressure, the positive pressure regulator ensures a safe breathing environment during operations such as interior firefighting or hazardous materials response under ICS protocols.
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Category context: PPE, SCBA, apparatus components, hose, nozzles, tools, and operational equipment terminology.
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