Quote:
Originally Posted by spudcon
I got thinking about CO2 being heavier than air, but I guess you explained that too.
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CO2 (and CO, which is why your household CO detector should be near the floor) is more dense than air, but that density is no match for the buoyant force of the heat from the fire. However that only applies in wildfires. Unventilated structure fires are a whole different ball game.