In the case of high noise control requirements, should use low noise ventilation pipe equipment. Different  types of ventilation duct equipment in the same air volume, wind  pressure, the wing type of centrifugal ventilation equipment, the noise  is small, forward version of the type of centrifugal ventilation  equipment, large noise. Properly reduce the speed of ventilation equipment. The  rotational noise of the ventilation equipment is proportional to the 10  times the impeller circumferential velocity, and the eddy current noise  is proportional to the 6th power (or 5 th power) of the impeller  circumferential velocity. So reduce the speed can reduce noise.

       When designing a ventilation system, the pressure loss of the system should be minimized. When the total amount of ventilation system and pressure loss is large, it can be divided into small systems. Air flow rate in the pipeline should not be too high, so as not to cause regeneration noise. Determine  the flow rate in the pipeline should be selected according to different  requirements according to different requirements.