Installation guide

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Appendix D Cooling system
The cooling system of HP 5900AF-48XG-4QSFP+ switches comprises the ventilation holes in the chassis, fan
trays, and built-in fans of hot swappable power supplies. To guarantee that this cooling system can effectively
work, you must consider the site ventilation design when you plan the installation site for the switches.
HP 5900AF-48XG-4QSFP+ cooling system
IMPORTANT:
The chassis and the power supplies use separate air aisles. Make sure that both aisles are not blocked.
The fan trays in the HP 5900AF-48XG-4QSFP+ switch must be the same type: LSWM1FANSC or
LSWM1FANSCB.
 When LSWM1FANSC fan trays are used, cool air flows in through the air vents in the fan tray panel
and the power supply panels, circulates through the chassis and the power supplies, and exhausts at
the network port side, as shown in Figure 42.
 When LSWM1FANSCB fan trays are used, cool air flows in through the air vents in the network
port-side panel and the power supply panels, circulates through the chassis and the power supplies,
and exhausts through the air vents in the fan tray panels, as shown in Figure 43.
Figure 42 Airflow through the chassis (with LSWM1FANSC fan trays)
(1) Power supply air vents
(2) Fan tray air vents
(3) Network port-side air vents
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