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Are you talking car fires, forest fires, house fires? The amount of oxygen consumed in a fire will depend on many factors including their size and intensity. It is easiest to explain when we think of a house fire. Imagine a closed off room with a small fire burning in it, as the fire grows it consumes more oxygen. When you hear fire fighters talk about back drafts this is what they are talking about. When a fire has consumes all of the air in a room and then , say someone opens a door and a rush of air enters the room , this causes a sudden explosion of the fire , a back draft. Sometimes like in a forest fire the fire is so intense that it sucks in all the air from in and around it and draws it up into the column of smoke it produces. So potentially a fire can consume 100% of the oxygen within itself and possibly its perimeters.
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