How to choose a low-noise centrifugal fan, which points need to know?

Low noise centrifugal fan selection needs to pay attention to which points? As the fan get the wrong model specifications will jeopardize the normal application. The key performance parameters of the fan are the output power, air volume and working pressure. That people in the usual selection of the actual points to pay attention to which points?
　　1, before selection, should understand the fan manufacturing and product quality status, such as the type of manufacturing, specifications and models and the main uses of different commodities, etc., to facilitate the first choice of centrifugal ventilator.
　　2, according to the transport of vapor physics, physical properties of different, select different main uses of low-noise centrifugal fan. Such as the transport of explosive and combustible gases should be taken to have the role of explosion-proof; transport of corrosive vapor should be selected to prevent corrosion centrifugal ventilator; work in high temperature places or transport of high temperature vapor should be selected heat-resistant, etc.. According to the different roles into several series of products, can consider the different requirements of customers.
　　3, in the exhaust fan selection characteristics data chart to find out there are about two kinds of fans available to choose, should first choose a higher efficiency, machine number is smaller: adjustment of the scope of this large, perhaps should also be more multifaceted, thoughtful and decision-making.
　　4, if the selected centrifugal impeller diameter is slightly larger than the original centrifugal fan centrifugal impeller diameter, so as to use the original motor shaft, rolling bearings and rubber bearings, etc., the motor start-up time, the compressive strength of the original components of the fan and the critical value of the shaft speed ratio to carry out the carry-over.
　　5, in the selection of low-noise centrifugal fan, should minimize the selection of fans in series or tandem work. When it is difficult to avoid, should be selected with the same type, the same characteristics of the fan in cooperation with the work. When selected in series, the primary centrifugal fan to the CFA secondary centrifugal fan middle need to have a pipe connection, and maintain the same exhaust volume.
　　6, the use of low-noise centrifugal fan should take into account the flexible use of the original machinery and equipment, suitable for on-site installation and safety operation and other problems.