If you are talking about portable Oxy, then it's thought for the cabin. There are different brands, ours has 2 outlets, one for 4 liters/min and the other for 2. There is one mask attached and one spare. You use it for passengers who feel sick or to recover after a decompression.
The 4 liters is for adults in the beginning, you can change to 2 if they feel better. 2 is for children and infants.
Our masks are never 100%, they are mixed with ambient air, that's why they're not suitable for smoke conditions. For that you have the PBEs, eigther Scott or Dräger.
Maybe I could help,
Dani