Trane TRG-TRC013-EN manual Fan Surge Line, Percent of Wide-OpenAirflow

g

Fan Surge Line
surge
line
static pressure
airflow	g EE

K

a fan performance curve where surge occurs. As long as the fan’s operating point falls to the right of this line, the fan will operate in a stable manner. If the fan is operated at a point that falls to the left of this line, the fan will surge.

Percent of Wide-Open Airflow
surge	50%
line		% wide-open
pressure	60%	airflow
		70%
		80%
static
		90%
		100%
	airflow	g EF

Finally, to serve as a guide for selection, curves are established to indicate the percentage of wide-open airflow being delivered by the fan at various operating points.

This completes the typical fan performance curve. It shows the relationship between pressure and airflow, and can be used to graphically represent the fan’s interaction with the system.

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