Allied Telesis AT-GS950/10PS - Manual (Page 36)

Chapter 1: Overview
36
Fans
Both the AT-GS950/16PS and AT-GS950/48PS switches have internal
fans. You cannot remove or replace these fans in the field. The fan status
is indicated with the SYSTEM LED. See “PWR/SYS LEDs” on page 24 for
more information.
Note
The AT-GS950/10PS switch does not have a fan.