toobfreak
Tungsten/Glass Member
As long as you're off the burning "idea".
There are many ways of burning oxygen. You don't need a flame, it can be done chemically, mechanically, reactively. Either way leads to the destruction of free oxygen as it is consumed/combined with other elements and compounds. Soon as you get your air to 80% or better nitrogen, you have a cheap, essentially free breathable gas which will kill.