Text: “In Korea you cannot sleep with the fan on in a closed room. You will die. My mom would come into my room at night and turn the fan off, and if she found me sleeping with it on, she would wake me up and get mad.” IW explained that some say the fan creates a vacuum and you suffocate, some say it lowers your body temperature too much and you get hypothermia and die. The fans they sell in Korea come with a built-in timer for this reason.

Context: IO is a Korean American student whose parents are first-generation immigrants from Korea. She heard the belief from her mother growing up. Within South Korea the belief is widespread enough that mainstream Korean newspapers have historically reported “death by electric fan” as a cause of overnight death, that the Korean Consumer Protection Board has issued formal warnings. IO does not really believe the fan can kill her, but she will not sleep with one running and still uses one that features a timer. 

Analysis: Fan death is one of the cleanest cases of a modern technological folk belief. Electric fans are 20th-century technology, so the belief cannot be ancient, yet it has matured remarkably quickly. Already a namesake of parent-to-child transmission at bedtime, multiple proposed mechanisms (of death) that vary by account, and a thick web of social and material reinforcement, from newspaper death reports to government warnings to the physical timers built into the fans sold in Korea.