离心通风机虽有其本身的优点,但也存在着主要的缺点——空气噪音级高,达到90～100分贝。离心通风机的噪音谱对人有着非常有害的刺激作用。所以,通风机必须装有专门的消音屏障或装有进口或出口消音器。在设计通风系统和空气调节系统时,这种方法的使用还不难,但对已经在运行的系统来说,就常常难以实现。研制了简单可靠的降低通风机噪音的方法,并不需要增加通风机的重量和尺寸,也不 Centrifugal fan although its own advantages, but there are also major drawbacks - high level of air noise, reaching 90 to 100 dB. Centrifugal fan noise spectrum has a very harmful stimulus. Therefore, the fan must be equipped with a dedicated silencer barrier or equipped with an inlet or outlet muffler. This method is not difficult to use when designing ventilation and air conditioning systems, but is often difficult to achieve for systems already in operation. Developed a simple and reliable way to reduce fan noise, do not need to increase the fan weight and size, nor