Usually after the installation of the negative pressure fan, we can hear its buzzing sound, which has a certain impact on the residents living nearby, so this has also become a headache, is there any way to reduce its noise? 

For the suppression of noise, users can take the following measures: by increasing the aerodynamic load of the cascade and reducing the circumferential velocity, the noise of the negative pressure fan can be reduced obviously.Generally speaking, with reasonable worm tongue clearance and worm tongue radius, the rotating noise and eddy current noise of centrifugal negative pressure fan can be reduced by taking a larger front radius of wind tongue. The advantage of tilting the worm tongue is that it can greatly reduce the acting area of the pulsating aerodynamic force in the same phase, thus reducing the noise. a methodicalized fluidization device can be added at the inlet (outlet) of the impeller so that the airflow velocity and pressure gradient behind the blade back net can quickly become uniform so as to reduce the noise. The air flow can also be transformed into turbulence to reduce noise by setting a zigzag structure on the inlet and outlet edge of the moving blade. If users can reasonably use these noise suppression methods, they can stay away from noise.