As the temperature of the Raspberry Pi 5 increases, the fan reacts in the following way:
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below 50°C, the fan does not spin at all (0% speed)
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at 50°C, the fan turns on at a low speed (30% speed)
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at 60°C, the fan speed increases to a medium speed (50% speed)
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at 67.5°C, the fan speed increases to a high speed (70% speed)
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at 75°C the fan increases to full speed (100% speed)