19
Rev. 2 – 10
th
November2015
Choosing the right fan size
Other important aspects than the fan performance when there are the fan noise and the fan efficiency.
Fan Noise
In figure 24 is shown the indicative distribution of the Sound Pressure Level of a DDMP
model .
The DDMP fans can reach high speed compared to the std. AC fans, therefore it’s
important to evaluate the speed at the required performance to avoid noise problems
Fig.24 – DDMP Noise distribution – Sound Pressure Level – Example DDMP 7/9
Fan Efficiency
In figure 25 is shown the behavior of the Total Efficiency of a DDMP fan changing the speed (in the example
the size 7/7).
Fig.25 – DDMP Efficiency behavior – Example DDMP 7/7
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