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18 TRG-TRC013-EN
notes
period one
Fan Performance
Assuming the system does not change, the static-pressure loss due to the
system varies with the square of the airflow. Other points on the system
resistance curve are determined by using the following fan law equation:
For example, when the same system is delivering 2,000 cfm [0.94 m
3
/s], the
static-pressure loss due to the system pressure is 0.65 in. H
2
O [159 Pa].
System Resistance Curve
Static Pressure
2
Static Pressure
1
Airflow
2
Airflow
1
Airflow
2
Airflow
1
2
2
Figure 27
Static Pressure
2
Static Pressure
1
---------------------------------------------
Airflow
2
Airflow
1
-----------------------
2
=
Static Pressure
2
2.0 in. H
2
O
2,000 cfm
3,500 cfm
---------------------------
2
× 0.65 in. H
2
O==
Static Pressure
2
491 Pa
0.94 m
3
/s
1.65 m
3
/s
---------------------------
2
× 159 Pa==