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Jeff, say more about why you need a "hard" mask? is that as opposed to a "soft" mask?
On Jan 13, 2013, at 5:51 PM, Craig Jimenez wrote:
or cannula- should they be worn around your neck and plugged in just in
case? Flow adjustments-
IVP folks have nice cabin altitudes under normal operation, but in the
Meridians and P-Barons I fly, cabin altitudes tend to be in the 8-10,000'
range in cruise. I've been using a Mountain High pulse demand system with
cannula to stay a little smarter. I test it before flight and then set it
to provide O2 above cabin alts of 5000'. A nice benefit is that it will
automatically adjust O2 flow to compensate for cabin altitude, so in the
event of depressurization or failure to pressurize, I have appropriate O2
on and flowing.
Note that a mask must be available above 18,000' (it is possible to forget
to breath through the nose and I guess there needed to be an easily
remembered cut-off altitude for cannulas). In my case, the mask is part
of the installed (but small and expensive to refill) system.
Craig
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