The negative pressure fan uses the cooling principle of air convection and negative pressure ventilation. The negative pressure fan is a kind of machine that inhales fresh air naturally from the opposite side of the installation site-the gate or window, and quickly forces 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%. 

The whole machine adopts CAD/CAM design, which has the characteristics of low investment cost, large air volume, low noise, low energy consumption, smooth operation, long life, high efficiency and so on. The shutters can be raised and closed automatically to achieve dustproof, waterproof, beautiful and generous; it can not only blow, but also be ventilated, so it is the choice of cooling and ventilation in modern workshop. The negative pressure fan with environmental protection and energy saving will become the mainstream of ventilation and cooling equipment market. 

1.for ventilation and air exchange: installed outside the window of the workshop, generally choose the lower tuyere, draw out the air, draw out the peculiar gas; there are many applications, such as the general negative pressure fan factory and so on. 

2.use with wet curtain: used for cooling and scorching summer in the workshop, no matter how hot your workshop is, the wet curtain-negative pressure fan system can reduce the temperature of your workshop to about 30C with a certain degree of humidity.