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In this case, the opening of the intake and exhaust has the same area as that of the
2
fan (14400 mm
). This means that you only have to deal with the turbulent
pressure.
A single fan at 3.75 mm of H
flow. Using the previously mentioned formula, you get:
dTc=0.05 x P/Q
dTc=0.05 x 300/0.66
°
dTc= 22.7
C of rise in the enclosure.
Optimal placement
Optimally, the fans will be placed in front of the PCIe/PCI/PCI-X boards, as
illustrated in the following diagram, to increase the airflow between boards and
prevent hot spots:
Flow/pressure charts
Refer to your fan's data sheet for flow/pressure charts (available from fan
manufacturer). If you use fans in series, you must stretch their chart vertically by
2. If you use fans in parallel, you must stretch their chart horizontally by 2. By
doing so, it becomes clear that if for a certain pressure, a fan gives 0 air flow, adding
a fan, even in parallel, does not help.
O of pressure results in about 0.66 m
2
Ventilation requirements
3
/min of air
159
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