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Fan: rotating fan, hand-operated for the purpose of air conditioning invented during the Han dynasty (202 BC-220 AD) a skilled craftsman and engineer Ding Huan (born 180 a.d.). Air conditioning had seven wheels 3 m diameter in the 8th century, Tang dynasty (618-907), when the air conditioning the Chinese used to rotate blower wheel hydraulic power. More dissemination of the rotating fan got in the era of the Song dynasty (960-1279). [59] [60] the first rotating fan in Europe appeared in the 16th century and was used for ventilation shafts, as evidenced by George Agricola (1494-1555). [61]
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