the goal with this method is to bring the concentration of CO in the air, in a confined space, to at least 10,000ppm (ten thousand parts per million).
carbon monoxide is very lethal, even in tiny doses if constantly exposed - but with a concentration as high as this, unconsciousness will occur in a matter of seconds to a few minutes, with death following very shortly after - leaving you no time to experience any painful symptoms that may arise.
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as for heat - i plan to carry out this method during cold weather. so for me, i don't think this will be an issue.
there is a thread (which i have linked below) where the poster took temperature readings, and found that the temperature increased by only about 10°C.
i doubt that one would need to be conscious inside the tent/ room long enough for heat to be an issue, since death will occur in a matter of minutes.
But how don't the bottom of it melt with coals? I mean the metal buckets for that are made for ashes and used coals gets so hot that it will burn anything from its bottom if there is no wooden thing underneath it (they are made for empting cold or warm ashes from fireplaces and burn from bottom...
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