Do you know what is negative pressure fan and positive pressure fan?

Negative pressure fan because of its nature is to exhaust the air in the room, so that the room air is scarce and relative to the 

outside world is a negative pressure, so it is called negative pressure fan. And the positive pressure fan can be interpreted as

 forced air supply

Into the room, that is to say, the best front negative pressure fan placement direction, from the original exhaust into the air supply, 

this is the positive pressure fan.

I believe we all know that negative pressure fan and positive pressure fan are very good equipment for ventilation and cooling. So the 

question comes, what is the negative pressure fan and the positive pressure fan? Let's find out.

What is negative pressure fan and positive pressure fan

Negative pressure fan because of its nature is to exhaust the air in the room, so that the room air is scarce and relative to the outside world

 is a negative pressure, so it is called negative pressure fan.

And positive pressure fan, can be interpreted as forced air supply into the room, that is to say, the best front negative pressure fan placement 

direction, from the original exhaust into the air supply, this is the positive pressure fan.

Difference between negative pressure fans and positive pressure fans

1, installation is different

Positive pressure fans are usually placed in the relatively high Windows of buildings, and negative pressure fans are usually placed outside the

 Windows of the workshop, placed in the lower tuyere, easy to draw air outside, outdoor fresh air into the air convection

The role of

2, the exhaust principle is different

The negative pressure fan is to exhaust air to make the room air scarce, thus producing the negative pressure area, and the outside air flows in to play the effect of ventilation.

On the contrary, the positive pressure fan pumps air to the room.

3. Different functions.

Negative pressure fan focuses on ventilation cooling, odor elimination and dust elimination.

Generally, the positive pressure fan is mostly used in the escape corridor. In case of a fire accident, the electric machine inside will open the tuyere, and the smoke sensing or manual fire alarm will start. The positive pressure fan on the top of the tower will be fully automatic

Open, pressure on the air supply shaft air supply, the front chamber of the staircase through the positive pressure air supply port will continue to supply air to the front chamber, so that the front chamber to maintain positive pressure, to ensure that the smoke no longer spread in this area, and to give people space to escape. when

When the temperature exceeds 280 degrees Celsius, there is no possibility for people to escape. The fuse inside will be blown, and the tuyere will be automatically closed to avoid the spread of the fire.