Dräger – BG-4
The Dräger PSS® BG 4 plus is a closed-circuit breathing apparatus which is independent of the surrounding air and particularly suited for long-term assignments in a toxic environment. Soda lime absorbs the carbon dioxide in the exhaled air and oxygen is constantly added and not guided outside – such as in breathing apparatus with pressure gauge – but kept within the circuit. Depending on job performance, the duration of use is up to four hours. For oxygen supply, compressed oxygen is used.
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