What is correct about the SCBA during operation?

The correct answer highlights the importance of the purge valve position during SCBA operation. When the SCBA is upright, the purge valve should indeed be in the closed position. This design helps to prevent any unintended release of air, ensuring that the firefighter maintains a steady supply of breathable air. The closed position also minimizes the risk of contaminants entering the system, which is critical in hazardous environments.

Understanding the operational features of SCBA is essential for firefighters as it ensures they can effectively utilize their equipment while protecting themselves in emergency situations. In contrast, the other statements present incorrect practices or misunderstandings about SCBA operation, thus reinforcing the importance of proper training and adherence to safety protocols.