Allied Telesis GS950 PS V2 Series - Figure 25: Unsupported Switch Orientations on a Wall

GS950 PS V2 Series of Gigabit Ethernet PoE+ Switches Installation Guide
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Do not install the switch on a wall with the front panel facing left or right.
These orientations may reduce airflow though the device, which can cause
it to overheat. Refer to Figure 25.
Figure 25. Unsupported Switch Orientations on a Wall