H3C Technologies H3C S5820X Series Switches - Manual (Page 29)

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Figure 12 Airflow through the S5820X-26S chassis (with LSWM1FANSCB fan trays)
(1) Fan tray air vents (2) Power module air vents
(3) Network port-side air vents
IMPORTANT:
The chassis and the power modules use separate air aisles. Make sure that both aisles are not blocked.
(3)
(2) (2) (1) (1)