There are many kinds of fans on the market. Negative pressure fans, axial fans, centrifugal fans, Roots fans, etc. are suitable for different environments, and each brand of fans is divided into fans of various performances, such as: negative pressure fans There are explosion-proof negative pressure fans, anti-corrosion negative pressure fans, stainless steel negative pressure fans, etc. What kind of environment are they suitable for? How to choose negative pressure fans in different environments? What are some good ways?

　　1. There is no special requirement for the fan for ordinary exhaust, as long as it meets the design conditions and customer requirements, it is the same for ordinary civilian fans. However, the speed of the fan generally chooses a lower speed, because the speed is too high, the overall operating noise is large, and the fan and its components are easily damaged, such as bearings and shafts, belts and pulleys, which lead to frequent replacement of parts and improve The maintenance cost. At this time, the basic negative pressure fan can be used to achieve the effect of exhaust.

　　2. There are many types of process exhaust, and some may contain welding slag, paint, explosive gas, and sometimes require high temperature, smoke exhaust, etc. Different components and different treatment methods require different requirements for fans.

　　3. Welding slag in the gas: filter screen should be added, and the motor cannot be built-in; the welding workshop or blanking workshop should usually take into account the metal swarf and welding slag contained in the exhaust gas. If these impurities enter the fan, they may scratch and wear bearing belts and other parts, and more seriously damage the motor and cause the motor to be scrapped. All requirements are equipped with a primary filter (filtering particles with a diameter of less than 1 mm) and an external motor (to prevent metal chips from entering the motor).