Before choosing a new fan, one should understand the production and product quality of the new fan in China, such as the varieties, specifications and special USES of the new fan, the development and promotion of the new product, and take environmental protection requirements into consideration when choosing a new fan. Heater fresh air unit mainly deals with outdoor air, and air conditioner deals with air handled by new fans. However, the new fan can have return air or fresh air, both in order to better adjust temperature and humidity parameters.

According to the different physical and chemical properties of the fresh air conveyor, different USES of fresh air fans are selected. For example, the delivery of a new type of explosion-proof combustible gas fan; Dust or pulverized coal fans shall be used dust or pulverized coal; Anticorrosive type new type ventilator is used for conveying corrosive gases; The high temperature gas under the high temperature environment should choose the high temperature ventilator.

Two or more new fans are found in the performance table of fresh air selection. The more efficient, the fewer. Of course, compare a larger adjustment range and weigh the pros and cons. If the diameter of the fan impeller is chosen to be much larger than the diameter of the original fan, the original part of the fan strength calculation and the critical speed of the shaft must be used in order to make use of the original motor shaft, bearing and support, the starting time of the motor, the initial part of the fan and the critical speed of the shaft.

When the centrifugal fresh air fan is selected, the motor power is less than or equal to 75KW, and the valve cannot be installed when starting (functions: cut-off, diversion, voltage stabilization, shunt, etc.). Heater fresh air unit mainly deals with outdoor air, and air conditioner deals with air handled by new fans. However, the new fan can have return air or fresh air, both in order to better adjust temperature and humidity parameters. A fresh air exchanger is an air-conditioning unit that provides fresh air. In terms of function, it can realize constant temperature and humidity, or simply provide fresh air according to the requirements of the use environment. Functions such as dust removal, dehumidification (or humidification), cooling (or heating) can be determined according to the needs of the use environment. The more complete the function, the higher the cost. When high temperature flue gas or air is discharged, when centrifugal boiler induction fan is selected, the starting valve should be set to prevent overload in cold operation.

Noise reduction requirements of ventilation system: the circular speed of impeller (refers to wheel propeller) should be selected first for high and low efficiency of the new ventilation system. The corresponding noise reduction measures should be the ventilation system with vibration noise (dB) and vibration propagation mode. Spring shock absorber or rubber shock absorber can be used to reduce the vibration of fresh air fan and motor.