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Eric Dufayet
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World
world · BBC
Eric Dufayet explained the "30" rule for starting a fire, which requires a temperature of at least 30°C, a maximum humidity of 30%, wind less than 30 km/h, and at least 30% of the cigarette unburnt.
“To start a fire, he explains, there must be 'a temperature of at least 30C (86F), a maximum of 30% humidity, wind of less than 30km/h (19mph), and at least 30% of the cigarette unburnt.'”
30 °C
30 %
30 km/h
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