Yes, I think so. So if I use a mask, then is there some upper limit?
This seems counter-intuitive. It seems like nasal canulas deliver
oxygen more directly into the lungs (assuming you are a nose
breather)...especially if you use a pusher (a little device that detects
when you breath and pushes O2 to you...and then shuts it off when you
are not breathing). What am I misunderstanding here?

-Sami


Aaron Coolidge wrote:

O. Sami Saydjari wrote:
: I seem to recall that my portable 02 system said something about not
: being about to go above 20,000 feet with it. This does not present a
: problem with my Turbo Arrow since that represents its service ceiling.
: Now, I am contemplating a Cessna Turbo 310 R and I am wondering whether
: the 02 will be the limiting factor on how high I fly?

: -Sami

For some reason, the nasal "cannula" oxygen systems state they should not
be used over 18000 feet. Perhaps this is the limit you're thinking of?