The most common way is to install a frequency converter.

The frequency converter can adjust the speed of the motor, the motor speed adjustment, the blower's air volume can be adjusted, generally in the case of no other problems in the blower, adjust the blower speed can change the air volume.

What should I do if the air volume is reduced due to blower failure?
If there is a fault in the blower, resulting in insufficient air volume of the blower, it is necessary to repair the blower first, such as: the impeller of the blower is seriously worn, we need to repair the impeller first, after the impeller fault repair is completed, then observe the air volume of the blower, if it is still not enough to adjust.
What should I do if there is too much air?
In actual use, if the air volume of our blower is too large, the solution is to increase the bypass outlet to reduce the air volume, increase the bypass pipeline, which may cause a decrease in wind pressure, which needs to be seen according to the actual situation, if the pressure is enough, you can increase the bypass to reduce the air volume.
In view of the difference in blower air volume caused by the inaccurate model, we must do a good job before purchasing Roots blower, the blower model selection will cause energy waste, and the blower model selection is small, which directly leads to unavailability.