In these systems, the user carries the breathing air in bottles on his back. This means the user can continue to operate autonomously. The disadvantage of this system is that there is only a limited air supply.
The devices are used in conjunction with a lung demand valve and a full-face mask. When working with lung demand valves, there is always pressure in the mask, and the regulator will use the user's breathing rhythm.
These devices are the best devices for working in environments where there a risk of a lack of oxygen. Training is an absolute necessity when it comes to wearing a breathing apparatus.
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