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Alex, some of these devices can only be purchased with doctor approval, so your brother in law should consult his medical staff to see if his condition warrants a device. Secondly, there is tank oxygen and there is medical grade oxygen, he would need medical grade if he is approved. I agree with the statement in previous posts regarding the dangers of pure oxygen, particularly blood saturation effects on CO2 Levels. CO2 blood level actually triggers the body's autonomic breathing activity.
Re concentrator, they require power, and you have to notify your power company if you have a concentrator.
Finally, never be shy about calling an ambulance if your in a life threatening situation, but I know not everyone lives near enough to an ambulance station, nor can be assured of adequate response times to make a difference. I learned alot about this when I had my heart attack in 2018.
And Alex regarding your interest in air for fire fighting, or survival, there are numerous bottled air solutions th at would probably meet your needs (not pure oxygen, just regular air supply). There are also some very useful smoke hood devices available in ebay that can buy you precious time in evacuating through dangerous smoke.
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