Animal husbandry fan is also called negative pressure fan, which belongs to axial flow fan. It is called negative pressure fan because it is mainly used in negative pressure ventilation and cooling projects. The negative pressure ventilation and cooling project includes two aspects: ventilation and cooling. The problems of ventilation and cooling are solved at the same time. The negative pressure fan is also used in the positive pressure water curtain environmental protection air conditioning, positive pressure air supply, positive pressure blowing and other fields. Negative pressure fan is characterized by large volume, large air duct, large blade diameter, large exhaust air volume, ultra-low energy consumption, low speed, low noise, etc.

The air discharged from livestock makes the indoor air pressure drop, and the indoor air becomes thinner. The characteristics of livestock form a negative pressure area, and the air flows into the room due to the compensation of air pressure difference. In the practical application of the industrial plant, the livestock is installed on one side of the plant, the air inlet is on the other side of the plant, and the air from the air inlet to the livestock fan forms convection blowing. During this process, the doors and windows near the animal husbandry fan remain closed, forcing air to flow into the workshop from the doors and windows at the air inlet. The air flows into the workshop from the air inlet, flows through the workshop and is discharged from the workshop by the animal husbandry fan in line and orderly. The ventilation is thorough and efficient, and the ventilation rate can reach 99%. Through specific engineering design and design of ventilation speed and wind speed as required, any high heat, harmful gas, dust and smoke can be quickly discharged from the workshop, and any problem of poor ventilation can be completely solved at one time. The ventilation effect can be achieved within a few seconds after the fan is turned on.