The difference between negative pressure fan and positive pressure fan is as follows:

1. Different installation

Positive pressure fan is generally installed in the high window of the building, and negative pressure fan is generally installed outside the window of the workshop, installed in the lower air outlet, convenient to draw air outside, outdoor fresh air in, to achieve the effect of air convection.

2. The exhaust principle is different

Negative pressure fan is to exclude air outward, so that the indoor air is thin, thus forming a negative pressure area, outdoor air flows in, to achieve the effect of ventilation.

Positive pressure fan is just the opposite, it is to indoor pumping air.

3. Different functions.

Negative pressure fan is mainly for ventilation and cooling, to eliminate peculiar smell and dust.

Positive pressure fan normally use in escape corridor, more when a fire accident, its internal electricity chance to open the tuyere, temperature sense smoke or a manual fire alarm is open, the tower top positive pressure fan automatic open, to pressurized supply air shaft, the stair front room by positive pressure air supply outlet will continuously to supply air chamber before the front room to maintain positive pressure, guarantee the flue gas will not spread to the area, and escape the space to the person. When the temperature is higher than 280°C, there is no possibility of escape, and the internal fuse will fuse, and the tuyere will be automatically closed to prevent the spread of fire.