Re: Is it safe?
Ness,
Most people who require supplemental oxygen and also are able to travel or go about their daily tasks usually will only need about 2 to 4 liters per minute of oxygen. Since their respiratory systems convert some of this to carbon dioxide, the additional amount of oxygen added to the air inside your TM is very minute. Because of their folding features like the many velcro flaps, TMs' considerable air leaks make it less likely that oxygen would accumulate inside the trailers. Therefore, I doubt that the normal, 21.8% oxygen concentration of the air inside a trailer would even increase to 22% because someone inside it were breathing supplemental oxygen.
Having your family member on oxygen inside your TM should not pose a risk to you. Make sure, however, that no one close to him smokes a cigarette - as there is a small danger of it flaring up. As a physician, however, I believe that it is hazardous for anyone to be smoking, any time, even out in the open! :-/
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