Juniper SRX5800 Hardware Manual page 44

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There is a single air intake in the front of the services gateway. Air is pushed up through an air filter, through
the card cage, and then through the upper fan tray where it combines in a common exhaust plenum and
is exhausted out the upper rear of the system.
Figure 10: Standard-Capacity Fan Tray (Same Upper and Lower)
Figure 11: High-Capacity Fan Tray (Same Upper and Lower)
Figure 12: Air Filter
Figure 13: Standard-Capacity Air Filter Tray