How does rebreather mask work?

Related questions

1. Does insurance pay for oxygen?
2. What can cause an oxygen tank to explode?
3. Can you smoke in a house with oxygen?
4. How many liters of oxygen do you need for a non rebreather mask?
5. Do oxygen concentrators need maintenance?
6. Is oxygen covered by Medicare?
7. How many Litres is a simple face mask?
8. What is the difference between non rebreather mask and partial rebreather mask?
9. How does the oxygen mask work?
10. Do you need a prescription to get oxygen?

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