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3.8 Replacing the cooling fans
58 Chapter 3: Replacing pre-installed components
6. Remove the four screws securing each fan to the fan
bracket to remove them from the fan bracket.
Note: The Transport GX21 (B2735) uses
two different types of cooling fans which
operate at different speeds. The two fans
installed nearest the power supply have a
peak speed of 15,000 rpm. The remaining 3
fans have a peak speed of 11,500 rpm. The
two fans nearest the power supply should be
connected to the speed-controllable pin
headers (CPU1_FAN and CPU2_FAN) on
the mother board. See 3.8.1 Cooling fan con-
nections.