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Usually, nasal cannulas are good up to 18k. A full face mask is good to 25k.
Over 25k, because the partial pressure of O2 is so low, positive pressure
breathing and equipment is needed to maintain adequate O2 blood levels.

Bruce

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LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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