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Labelled diagrams illustrating open circuit crushing and closed circuit crushing describe the difference between the two setups

Jan 27, 2016 Closed-circuit SCBAS, also known as rebreathers, recycle exhaled gases and contain a small cylinder of oxygen to supplement the exhaled air of the wearer. Escape SCBAs provide air for a limited amount of time and should only be used for emergency escapes from a dangerous situation. The most common SCBA is the open-circuit, positive-pressure type

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