How to select the suitable centrifugal fan? by Xianrun Blower

Centrifugal fan selection is an important part, because it is related to  whether the centrifugal blower can play the highest efficiency.

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The 1st Stage of Selection:

The first thing is to confirm the air flow, air pressure, density of gas, which are the three basic elements in centrifugal fan selection process. 

1. Density is the primary elements in the selection process, if the density is unknown, it needs to calculate or convert the density according to the working environment, such as altitude, the local atmospheric pressure, operating temperature, and so on.

2. Air pressure is the second element in the centrifugal fan selection, according to a given or calculated the density of working condition, then convert the working pressure to the fan pressure of standard condition. If the fan is equipped with inlet box or silencer, 
it needs to consider the pressure loss, estimated losses are generally between 100-300 pa after the estimation.

3. Air flow is the third element in selection process. If the system require the gas mass flow rate, you need to convert the gas mass flow to volume flow rate in standard condition.

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The next step is to circulate centrifugal fan specific speed, which is an important step in the centrifugal fan selection process, as well as the main basis to choose centrifugal blower specific model.

Air volume/air flow		m3/h
Total pressure or static pressure		Pa
Medium temperature		°c
Voltage		V
Frequency		Hz
Altitude of operation place		m