1) Before choosing a ventilator, you should understand the production and product quality of domestic ventilator, such as the types and specifications of the ventilator produced, the special purpose of various products, the development and promotion of new products, etc., and the environmental protection should be fully considered In order to choose the best use of fans.

2) According to the different physical and chemical properties of the gas conveyed by the ventilator, choose the ventilator for different purposes. Explosion-proof ventilator should be selected for transporting explosive and flammable gas; dust exhaust or pulverized coal ventilator should be selected for dust exhaust or coal powder; anti-corrosion ventilator should be selected for transporting corrosive gas; working under high temperature or High-temperature ventilator should be selected for conveying high-temperature gas.

3) When there are more than two types of fans to choose from on the fan selection performance chart, the one with higher efficiency and smaller number should be selected first: the one with a larger adjustment range, of course, should be compared and weighed. Pros and cons are decided.

4) If the selected fan impeller diameter is much larger than that of the original fan, in order to use the original motor shaft, bearing and support, etc., the motor start time, the strength of the original fan components and the criticality of the shaft must be Rotation speed, etc. are calculated.

5) When choosing a centrifugal fan, when the motor power is less than or equal to 75KW, it is not necessary to install a valve only for starting. When a centrifugal boiler induced draft fan is selected for discharging high temperature flue gas or air, a valve for starting should be installed to prevent overload during cold operation.

6) For the ventilation system with noise reduction requirements, the fan with high efficiency and low impeller circumferential speed should be selected first, and make it work at the highest efficiency point; also according to the propagation mode of noise and vibration generated by the ventilation system, corresponding Noise reduction and vibration reduction measures. Vibration reduction measures for fans and motors generally can be based on vibration reduction, such as spring shock absorbers or rubber shock absorbers.

7) When choosing a fan, try to avoid using the fan to work in parallel or in series. When it is unavoidable, ventilators of the same model and performance should be selected for joint work. When a series connection is used, there should be a certain pipeline connection between the stage fan and the second stage fan.

8) The fresh air blower selected should be considered to make full use of the original equipment, suitable for on-site production, installation and operation.