What is the difference between a fan and an exhaust fan?

The difference between fan and exhaust fan is as follows: 1, and they are different in nature. A fan refers to a device that generates wind and cools down in hot weather. An electric fan is a device that is driven by electricity to generate airflow. When the fan is energized, it turns into natural wind to enjoy the cool air. Exhaust fan, also known as cross-flow fan, centrifugal fan and small fan, is a general air source for blowing or inhaling air. Usually used to inhale mechanical equipment. As the name implies, it is also called exhaust fan. They come from different backgrounds. Fan originated from 1829. Inspired by the structure of clocks and watches, an American named james byron invented a mechanical fan which can be fixed on the ceiling and driven by clockwork. The cool breeze brought by the fan leaves makes people feel happy, but it is very troublesome to climb the ladder and wind it up. 1933, the University of Hanover, Germany discovered the working principle of the blower and successfully manufactured its products. The application of high-pressure blower has been popularized. 3. Their characteristics are different. The fan is certified to see if it meets the national first-class energy efficiency standards. Low noise, good motor in quiet environment, only hear the wind rustling. No peculiar smell, peculiar smell is the smell produced by the insulating paint on the copper sheet of the electric fan during operation. Electrical safety: the safety requirements of electric fans are stipulated in national standards, and consumers can also conduct simple tests. In terms of ventilation principle, exhaust fans can be divided into four types: high, medium, low and negative pressure. The negative pressure fan series is usually designed by CAD/CAM. They have the characteristics of low noise, low power consumption, large air volume, stable operation, long service life and high efficiency, and have an automatic shutter opening and closing system to realize waterproof and dustproof and beautiful appearance.