What is the difference between the principle of electric fans and ventilation fans?

The principle is the same, but the way of use is different. The main design of the electric fan is to speed up the indoor air flow in a certain space to accelerate the evaporation of the human body's own sweat to make people feel cooler. Of course, it can also be used for other purposes. Specifically do not need to explain one by one, the ventilator is relatively speaking. It's on the opposite side of the fan, blowing the air outside. The air flow from the inner phase outward flow, to achieve the room inside the fumes out and ensure that the indoor air circulation and design.