I believe airline cabin pressure is somewhat below 10,000 ft...



"Vaughn Simon" wrote in message
...

"Chris W" wrote in message
news

Why are we having this argument? Is it not true that people use
concentrators
at altitude in unpressurized planes and they don't pass out? If that is
the
case, and it is my understanding that it is, then they must work. So
what is
the argument about?

It beats me. I have sat in a 10,000 foot cabin pressure in an
airliner and
monitored my wife's blood ox sats with and without the concentrator. I
can tell
you for sure that a concentrator works just fine under that situation.

Vaughn