OCFA Self-Contained Breathing Apparatus (SCBA) Practice Exam

Which component on the Mask Mounted Regulator (MMR) is used to purge air from the system?

Spray Bar Manual Purge Valve Air Saver Switch Regulator Gasket

Correct Answer:

Manual Purge Valve

Explanation:

Purging air from the MMR is done with the manual purge valve. This valve is opened to vent air from the regulator path to the outside, clearing the line of moisture, debris, or stale air so the system is clean and ready for breathing when you begin use. The other parts aren’t used to vent the system: the spray bar is not the vent path, the air saver switch is there to conserve air by modifying flow, and the regulator gasket is just a seal.

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