FlyerTalk Forums - View Single Post - How do you know if an oxygen mask is working?
Old Jul 6, 2019, 1:59 pm
  #2  
Loren Pechtel
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Join Date: Jun 2005
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I do not believe there is any sort of flow indicator.

The generator is spitting out pure oxygen. The bag collects it during the time you're not inhaling.
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