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Fan death is a well known superstition 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.

This makes Chittagong the crossroads of the Indian subcontinent and Southeast Asia.People who believe this theory think a fan operating in a closed room all night can lower temperature to the point of causing hypothermia.Simple physics implies that fans do not cause room temperature to drop; if anything, it should rise slightly because of the fan motor's heat output.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.

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