MIL-PRF-18953C(SH)
6
SYSTEM
RESISTANCE LINE
5
4
FAN STALL REGION
FAN VOLUME-
FAN HIGHEST TP
PRESSURE DESIGN
POINT PER 1.2.2
(c)
3
(a)
FAN STABLE
+5%
OPERATION
*1 INCH
REGION
WG ĆP
2
-2%
(b)
60% OF DESIGN
PRESSURE OR TO
1
PRESSURE VALUE
SHOWN ON FIG 4
FOR FAN SIZES 17
AND 28
PERFORMANCE
CURVE FIG 4
0
0
2
4
6
8
1
0
1
2
1
4
AIRFLOW VOLUME CFM THOUSANDS
* UNDER ALL CONDITIONS ACTUAL FAN PERFORMANCE CURVE MUST MEET THE
REQUIREMENT THAT POINT (c) IS RELATED TO POINT (a) AS SHOWN.
FIGURE 3. Region fan stall, recovery, and stable operation.
22
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