What type of air does an Open-Circuit SCBA use?

An Open-Circuit SCBA (Self-Contained Breathing Apparatus) uses compressed air as its primary source of breathable air for the user. This type of SCBA is designed for situations where the user may be exposed to hazardous atmospheres, such as areas with smoke, toxic gases, or low oxygen levels.

The critical mechanism of an Open-Circuit SCBA is that the air is stored in high-pressure cylinders and is delivered to the wearer through a demand valve. As the user inhales, the valve opens, allowing the compressed air to flow into the mask, providing a safe and breathable environment for the firefighter. After exhalation, the exhaled air is vented to the atmosphere rather than being recirculated, which is a distinguishing feature of open-circuit systems.

Choosing compressed air is essential because it is readily available, non-toxic, and allows for an adequate supply of oxygen for the user during firefighting efforts and rescue operations.