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I’ve never thought of that before! I had heard of the effect and always thought it was a freak case that spiraled into fame, but CO2 accumulation actually makes perfect sense.

So, would that not normally happen without a fan? If a room is that small, and that pooorly ventilated, how does a fan make the co2 concentrate in a more dangerous way?

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Unless your fan has a gas motor, it's not going to produce any CO2. The tiny Korean room, which I'm betting is not any smaller than your average New York City bedroom, would have to be pretty poorly ventilated indeed for you to not survive the night.

Not sure if you're joking, but no, that doesn't make any sense. Asphyxia is a lack of oxygen, not an excess amount of CO2. Even slight increases in CO2 will make you feel extremely uncomfortable, long before you actually run out of oxygen.

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