Fan Data
Calculating Total Static Pressure
Example
Indoor Unit Model Ref = V50-CW-EZRE-2
Design Air Volume = 4.4m³/s
Design External Static Pressure (ESP) = 85Pa
• Plot the Design Air Volume from the X Axis vertically.
• Where the X Axis and the System Curve intersect, plot a line to the Y Axis, to establish the
Internal Static Pressure (ISP)
• Calculate the Total Static Pressure (TSP) of the system thus:
ISP + ESP = TSP
• Using the TSP, plot a line from the Y Axis to intersect with the Design Air Volume line. Where
the line intersects, an approximate Input Voltage can be estimated between those noted on the
graphs.
0
100
200
300
400
500
600
700
800
2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00
Static Pressure [Pa]
AirFlow [m
3
/s]
V50-60 Backward Fan Curve
DF 50
-
55
DF 60
1510 RPM
1250 RPM
1000 RPM
750 RPM
V 50
- 60
575
660
Internal Static Pressure + External Static Pressure = Total Static Pressure
e.g. 575+85 = 660
4.4
1510 rpm
136
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