The roof ventilating fan discharges air outward to lower the indoor air pressure, and the indoor air becomes thinner, forming a negative pressure zone, and the air is compensated into the room due to the air pressure difference. In the practical application of the industrial plant, the negative pressure exhaust fan of the factory is installed on one side of the plant, the air inlet is on the other side of the plant, and the air is convected by the air inlet to the negative pressure fan. In this process, the doors and windows near the negative pressure fan remain closed, so that the air is compensated into the workshop by the door and window of the inlet side. The air is lined up, and the order is flowed into the workshop from the air inlet. It flows through the workshop and is discharged from the workshop by the negative pressure of the factory. The ventilation is thorough and efficient, and the ventilation rate can be as high as 99%. Through specific engineering design, designing ventilation speed and wind speed according to needs, any high heat, harmful gas and dust smoke can be quickly discharged into the workshop, and any problem of poor ventilation can be completely solved at one time. Ventilation is achieved within a few seconds of turning on the exhaust fan.
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