Fan death

Fan death is a widely held belief in Korean culture, where it is thought that running an electric fan in a closed room with unopened or no windows will prove fatal. Despite no concrete evidence to support the concept, belief in fan death persists to this day in Korea, and also to a lesser extent in Japan and Russia.[1][2][3][4]

Fan death
Electric fans sold in South Korea are equipped with timer knobs that turn them off after a set number of minutes. This is perceived as a life-saving function, essential for bedtime use.
Korean name
Revised RomanizationSeonpunggi samangseol
McCune–ReischauerSŏnp'unggi samangsŏl

Origins of the belief

Where the idea came from is unclear, but fears about electric fans date almost to their introduction to Korea, with stories dating to the 1920s and 1930s warning of the risks of nausea, asphyxiation, and facial paralysis from the new technology.[5][6]

One conspiracy theory is that the South Korean government created or perpetuated the myth as propaganda to curb the energy consumption of South Korean households during the 1970s energy crisis, but Slate reports that the myth is much older than that – probably as far back as the introduction of electric fans in Korea, and cites a 1927 article about "Strange Harm from Electric Fans".[5][7][8]

Proposed causes


During the 1970s Korea experienced a sharp increase in the use of asbestos for building as it had a number of flame retardant properties[9]. The deadly material[10] can easily become friable, and the dust ends up resting on surfaces until disturbed by moving air around. When in an enclosed space, asbestos dust or fibres pose a legitimate health risk if the air is continually disturbed, as it may allow fibres to remain in the air for longer periods or even encourage more fibres to become airborne as the current airborne fibres become trapped in the victims lungs and are replaced by the phenomena of Brownian motion[11] and the fan disturbed air. Projections are expecting an increase in the number of cases of asbestos related lung cancers[12] as the latency period for the illness can be anywhere from 10 to 40 years[13].

Hyperthermia (heat stress)

Air movement will increase sweat evaporation, which cools the body. But in extreme heat – when the blown air is warmer than the body's temperature – it will increase the heat stress placed on the body, potentially speeding the onset of heat exhaustion and other detrimental conditions. The American Environmental Protection Agency (EPA) discourages people from using fans in closed rooms without ventilation when the heat index is above 32 °C (90 °F). The EPA does, however, approve of using a fan if a window is open and it is cooler outside, or when the heat index in a closed room is lower.[14]


Hypothermia is abnormally low body temperature caused by inadequate thermoregulation. As the metabolism slows down at night, one becomes more sensitive to temperature, and thus supposedly more prone to hypothermia. People who believe this theory think a fan operating in a closed room all night can lower temperature to the point of causing hypothermia.[15]


It is alleged that fans may cause asphyxiation by oxygen displacement and carbon dioxide intoxication.[15][16][17][18] In the process of human respiration, inhaled fresh air is exhaled with a lower concentration of oxygen gas (O2) and higher concentration of carbon dioxide gas (CO2), causing a gradual reduction of O2 and buildup of CO2 in a completely unventilated room.[19] This phenomenon is unrelated to the presence or absence of a fan.

Media coverage

During the summer, mainstream South Korean news sources regularly report alleged cases of fan death. A typical example is this excerpt from the July 4, 2011, edition of The Korea Herald, an English-language newspaper:

A man reportedly died on Monday morning after sleeping with an electric fan running. The 59-year-old victim, only known by his surname Min, was found dead with the fan fixed directly at him.[20]

This article also noted there was "no evidence" the fan caused the death, however. University of Miami researcher Larry Kalkstein says a misunderstanding in translation resulted in his accidental endorsement of the fan death theory, which he denies is a real phenomenon.[21]

Ken Jennings, writing for Slate, says that based on "a recent email survey of contacts in Korea", opinion seems to be shifting among younger Koreans: "A decade of Internet skepticism seems to have accomplished what the preceding 75 years could not: convinced a nation that Korean fan death is probably hot air."[5]

South Korean government

The Korea Consumer Protection Board (KCPB), a South Korean government-funded public agency, issued a consumer safety alert in 2006 warning that "asphyxiation from electric fans and air conditioners" was among South Korea's five most common summer accidents or injuries, according to data they collected.[22] The KCPB published the following:

If bodies are exposed to electric fans or air conditioners for too long, it causes [the] bodies to lose water and [causes] hypothermia. If directly in contact with [air current from] a fan, this could lead to death from [an] increase of carbon dioxide saturation concentration and decrease of oxygen concentration. The risks are higher for the elderly and patients with respiratory problems. From 2003 [to] 2005, a total of 20 cases were reported through the CISS involving asphyxiations caused by leaving electric fans and air conditioners on while sleeping. To prevent asphyxiation, timers should be set, wind direction should be rotated, and doors should be left open.

See also


  1. "よく聞く「扇風機をつけっぱなしにして寝ると死ぬ」ってホント?". NAVER まとめ.
  2. 「扇風機に当たったまま寝ると死ぬ」はホント!クーラーでも. 日刊SPA! (in Japanese). 15 August 2011.
  3. Ima sugu sore o yamenasai : dokutā morita no yameru dake de kenkō ni naru gojū no hinto. Subarusha. ISBN 978-4799105207.
  4. Sinelschikova, Yekaterina (2018-06-07). "Why are Russians so afraid of cold air drafts?". Retrieved 2019-07-16.
  5. Jennings, Ken (Jan 22, 2013). "Is Your Electric Fan Trying to Kill You? Fan death in Korea, the dangers of wearing red in the Philippines, and other momisms from around the world". Slate.
  6. "Strange Harm From Electric Fans", Jungoe Ilbo (Domestic and International Daily), July 31, 1927, "The rotating fan blades create a vacuum directly in front, and the intensity of the resulting air flow always results in an insufficient supply of oxygen to the lungs." (in Korean)
  7. "Fan Death". 6 June 2011.
  8. Herskovitz, Jon; Kim, Jessica (2007-07-09). "Electric fans and South Koreans: a deadly mix?". Reuters. Retrieved 2013-07-21.
  9. Hyoung, Kim. "Overview of Asbestos Issues in Korea". US National Library of Medicine. US National Library of Medicine.
  10. "Asbestosis", Wikipedia, 2019-09-12, retrieved 2019-10-22
  11. Helmenstine, Anne Marie. "Why Is Random Movement Called Brownian Motion, and What Does It Do?". ThoughtCo. Retrieved 2019-10-22.
  12. Kwak, Kyeong Min; Paek, Domyung; Hwang, Seung-sik; Ju, Young-Su (2017-08-17). "Estimated future incidence of malignant mesothelioma in South Korea: Projection from 2014 to 2033". PLOS ONE. 12 (8): e0183404. doi:10.1371/journal.pone.0183404. ISSN 1932-6203. PMC 5560642. PMID 28817672.
  13. "Latency Period of Mesothelioma: How Long the Cancer Takes to Develop". Mesothelioma Center - Vital Services for Cancer Patients & Families. Retrieved 2019-10-22.
  14. Excessive Heat Events Guidebook, United States Environmental Protection Agency. "Annex B: Use of Portable Electric Fans During Excessive Heat Events ... Don't Use a portable electric fan in a closed room without windows or doors open to the outside. ... Don't Use a portable electric fan to blow extremely hot air on yourself. This can accelerate the risk of heat exhaustion. ... Annex C: Excessive Heat Events Guidebook in Brief ... Don't direct the flow of portable electric fans toward yourself when room temperature is hotter than 90 °F."
  15. Surridge, Grant. (2004-09-22). "Newspapers fan belief in urban myth." JoongAng Daily, via and Retrieved on 2007-08-30.
  16. Adams, Cecil (1997-09-12). "Will sleeping in a closed room with an electric fan cause death?". The Straight Dope. Chicago Reader, Inc. Retrieved 2007-08-02.
  17. Watanabe, Toshifumi, and Masahiko Morita. (1998-08-31). "Asphyxia due to oxygen deficiency by gaseous substances." Forensic Science International, Volume 96, Issue 1, Pages 47–59. Retrieved on 2007-09-06.
  18. Gill, James R., Susan F. Ely, and Zhongxue Hua. (2002). "Environmental Gas Displacement: Three Accidental Deaths in the Workplace." The American Journal of Forensic Medicine and Pathology, 23(1):26 –30, 2002. Retrieved on 2007-09-06.
  19. "Concentrated Carbon Dioxide in Western Pennsylvania." Archived 2007-10-08 at the Wayback Machine The Pittsburgh Geological Society. Retrieved on 2007-09-06.
  20. "Summer death revives fan death myth". The Korea Herald. 2011-07-04. Archived from the original on 2011-11-25.
  21. South Korea's Quirky Notions About Electric Fans
  22. "Beware of Summer Hazards!" (Press release). Korea Consumer Protection Board (KCPB). 2006-07-18. Archived from the original on 2007-09-27. Retrieved 2007-09-01.
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