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> The issue of "air" in a nitrox tank - ie fO2 less than say, 22%, has more to
do
> with that formality of staying on the literal side of the labeling issue. 
"Air"
> is a nitrox, but it is not EAN.  

I think people read too much meaning into a Nitrox sticker.   I haven't
re-checked how the various agencies define what their nitrox stickers
mean, but I really don't care.  A nitrox sticker is a very public
way of announcing that the tank _may_ not contain simple 21% air
and that the user needs to be aware of its contents before
breathing off of it.  Period nothing more.

> the line.   What about 20%?, 19, 15?, etc.....

What about them?  The markings on the tank just told you not to use
the tank without knowing what is inside.

So the issue is whether a marked tank can contain a simpler mix.

As a related argument, can a trimix marked tank only contain nitrox?
(but I would argue a nitrox tank shouldn't contain trimix)

> Maybe in the future, clean air in nitrox labeled tanks will be more 
> acceptable.

That future is here in my mind and unless I go to Kansas I'm not turning 
my watch back.  But if I am away from home and go into a shop
with my nitrox tanks but only 21% mix in them, I do respect the right
of a shop to want to inspect them.  

Mike

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