In relation to SCBA inspections, what component must be rotated counterclockwise for air flow?

The purge valve is the component that must be rotated counterclockwise to allow air flow in a self-contained breathing apparatus (SCBA). The function of the purge valve is to provide a controlled release of air from the regulator, enabling the user to clear the system or to take a breath in situations where airflow may be restricted, such as a malfunctioning regulator.

When the purge valve is activated in a counterclockwise motion, it opens the pathway for air to flow directly from the cylinder, bypassing the regulator. This is particularly useful in emergency situations where the user needs immediate access to breathable air.

Understanding the role of the purge valve emphasizes the operational procedures firefighters must follow to ensure their safety while using SCBAs in hazardous environments. Each part of the SCBA has a specific function and knowing how to properly operate and inspect these components is crucial for effective and safe use.