Electronic fan capable of automatic fan speed adjustment according to ambient temperature conditions

An electric fan comprising:

• a fan unit;
• a temperature detector for generating a temperature output that varies in accordance with the ambient temperature;
• and
• a processor unit coupled to said fan unit and said temperature detector, said processor unit being operable so as to control said fan unit to rotate at a selected one of preset speed settings, and being further operable in an intelligent mode, wherein said processor unit determines a current selected one of the preset speed settings of said fan unit and receives the temperature output of said temperature detector so as to obtain a reference ambient temperature, wherein said processor unit controls said fan unit to operate at another one of the preset speed settings higher than the current selected one of the present speed settings upon detection of a predetermined increase in the current ambient temperature relative to the reference ambient temperature, and wherein said processor unit controls said fan unit to operate at yet another one of the preset speed settings lower than the current selected one of the present speed settings upon detection of a predetermined decrease in the current ambient temperature relative to the reference ambient temperature.