What does the term "CLASSIC SCBA" refer to?

The term "CLASSIC SCBA" refers to a type of self-contained breathing apparatus that incorporates a demand valve for airflow. This design is fundamental to many breathing systems used in scenarios where the user requires a reliable and consistent supply of breathable air, particularly in hazardous environments such as firefighting or rescue operations.

Demand valves operate based on the user’s inhalation effort, allowing air to flow into the mask only when the wearer inhales. This feature helps conserve the air supply and ensures that the user receives the necessary air only when needed, making it an efficient choice for many applications.

Understanding the significance of the demand valve in the "CLASSIC SCBA" provides insight into the functionality and reliability of traditional SCBA systems that emergency responders often employ.