Allied Telesyn AT-B15/SX Guía De Instalación Rápida página 16

Note
Keep the original faceplate for future use. If you should remove the
module, replace the faceplate to prevent dust and debris from entering
the unit and to maintain proper air flow.
Caution
Be sure to wear an anti-static wristband while performing the next step.
The AT-STACK1 module can be damaged by electrostatic discharge.
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Figure 4 Removing a Faceplate