Selection Process
Fan Performance Chart
Example 1:
The following are the design requirements for ADB300B2 unit:
From the fan curve (at 9500 CFM)
Standard operating system:
External Static Pressure of 200 Pa did not fulfill the design requirements.
Therefore at 9500 CFM and 340 Pa external static pressure,
From the fan curve, the design requirement calls for RPM about 885, whereas the unit can
only deliver RPM about 785 under the same CFM.
Therefore, it is necessary to RPM about 785 under the same CFM. Therefore, it is
necessary to resize the pulley sizes.
In order to obtain 885 RPM, we recalculate the new blower pulley as:
(while maintaining the motor pulley)
The nearest pulley size will be a diameter of 160mm
Recheck, with Db = 160 mm
We thus need to change the blower pulley from 180mm to 160mm in order to obtain the
higher operating static pressure.
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