Which breath apparatus type keeps exhaled air within the system?

The closed circuit breathing apparatus is designed to recirculate exhaled air within the system. In this type of apparatus, air that is exhaled is filtered to remove carbon dioxide and then returned to the user after being re-oxygenated. This efficient use of air not only minimizes the equipment's size and weight but also extends the operational duration for the user since less external air supply is required.

This technology is particularly beneficial in environments with limited air supply or for scenarios that require extended use, such as in firefighting or confined space rescues. The system's ability to hold and recycle exhaled air sets it apart from other breathing apparatus options, making it more effective in situations where air quality may be compromised or limited.