The cooling principle of the negative pressure fan: the negative pressure fan uses the cooling principle of air convection and negative pressure exchange to naturally inhale fresh air from the opposite side of the installation site-the gate or window, and quickly force the indoor muggy gas out of the outdoors. The problem of poor ventilation can be improved, and the effect of cooling and ventilation can reach 90%. 97%. 

Strong advantages of negative pressure fans: 

1. Low investment and low energy consumption. With the same cooling rate, the one-time investment is about 1/6 of the air conditioner, and the operating cost is about 1/10 of the air conditioner. 

2. The negative pressure fan has a remarkable cooling effect, which can reduce the temperature to about 28 degrees, which is consistent with the human body temperature. If the water from the well is used as the source of the water tank, the effect is better than that of air conditioning. 

3. The air is fresh and moist, and the cleanliness of the air can reach 99%.