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Fan death is a widely believed superstition in Korea. The idea is that"an electric fan, if left running overnight in a closed room, can cause the death of those inside (by suffocation, poisoning, or hypothermia)." http://en.wikipedia.org/wiki/Fan_death

Something like this could be very successful there, even if there are actually fans in it. Superstition is about appearance and intuition, not reality.

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It is not the fans that cause such a supperstition it is suffocation/hypothermia caused by continuous air flow that the superstitious think is the problem.

There are a lot of different reasons for this, including the fan blades chopping the oxygen molecules in half.

My cousin had a roommate in South Korea who believed that the fan would create a vortex that sucked the air from the room, creating a fatal vacuum.

http://en.wikipedia.org/wiki/Fan_death#Beliefs

"chopping the oxygen molecules in half"

The fans in Korea must have really fine blades.

or really big oxygen molecules o_O

Funnily, people in Austria seem to also believe that fans on at night make people sick. Not dangerously sick. They think it will give them colds.

I believe it about closed air conditioning systems, but not fans.

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