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Table 38: AM4024(E) Airflow Impedance by Zone [N/m²]
VOLUMETRIC
FLOW RATE [CFM]
5
10
15
20
25
30
35
40
Table 39: AM4024(E) Airflow Impedance by Zone [inches H
VOLUMETRIC
FLOW RATE [CFM]
5
10
15
20
25
30
35
40
5.1.2 Air flow Paths
The area between the front panel and the AMC Card-edge connector is divided into five zones, one I/O
zone and four uniform thermal zones, A, B, C, and D. The PICMG AMC.0 Specification states that the
uniformity of the airflow paths' resistance should provide an impedance on the A, B, C, and D zones
that is within ± 25% of the average value of the four thermal zones.
The following figure shows the thermal zones of the AM4024(E).
Figure 15: Thermal Zones of the AM4024(E) Module
I/O ZONE
ZONE A
32.8 mm
34 mm
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I/O ZONE
ZONE A
3.5
3.4
9.5
9.0
15.7
14.9
24.7
22.7
34.5
31.2
46.4
42.4
60.4
54.1
75.2
67.2
PRESSURE DROP [inches H
I/O ZONE
ZONE A
0.01
0.01
0.04
0.04
0.06
0.06
0.10
0.09
0.14
0.13
0.19
0.17
0.24
0.22
0.30
0.27
ZONE B
34 mm
PRESSURE DROP [N/m²]
ZONE B
3.4
8.9
14.6
22.4
30.8
41.4
53.1
65.8
O]
2
O]
2
ZONE B
0.01
0.04
0.06
0.09
0.12
0.17
0.21
0.26
ZONE C
ZONE D
34 mm
34 mm
User Guide
AM4024(E)
ZONE C
ZONE D
3.2
2.8
8.3
7.2
13.8
11.9
21.0
18.0
29.3
25.2
39.1
33.7
50.4
42.8
62.5
53.1
ZONE C
ZONE D
0.01
0.01
0.03
0.03
0.06
0.05
0.08
0.07
0.12
0.10
0.16
0.14
0.20
0.17
0.25
0.21
component
envelope
PCB
component
envelope
57
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