Fan death

In South Korea, there is a belief that when you run an electric fan in a closed room, it can cause death.

Proposed causes include better distribution of asbestos fibres in the air, or asphyxiation because of a shifted distribution between oxygen and carbon dioxide. The Korea Consumer Agency warned in 2007 that doors should be left open when sleeping with an electric fan turned on.

There is no proof for an actual causation. Probably, the deaths attributed to fans are heat strokes.