1, in the noise control requirements of high occasions, the use of low noise ventilation pipe equipment should be used. Different types of ventilation pipe equipment in the same amount of wind, wind pressure, airfoil wing centrifugal fan noise is small, the forward version of the centrifugal fan ventilator noise. Appropriate to reduce the speed of ventilation equipment. The ventilation noise is proportional to the 10th power of the impeller, and the eddy noise is proportional to the sixth power of the impeller (or 5th power). Therefore, reducing the speed can reduce the noise.

         2, the design of ventilation systems, should minimize system pressure loss. When the total amount of ventilation system and pressure loss, it can be divided into small systems, air flow velocity in the pipe should not be too high, so as not to cause regeneration noise, air flow pipelines to determine the speed should be selected according to different requirements according to the relevant provisions.