9-30 Upgrading Your ServerCooling Fan UnitTwo cooling fan units (front and rear) are factory-installed in your server. By installing optionalredundant fan unit (containing three fans), your server can contain up to five cooling fans forcooling the CPU, memory, and PCI devices. With optional redundant cooling fan unit, the servercan continue operation even if one of the fan units is defected.IMPORTANT: Be sure to ask your service representative for replacement ofcooling fan unit if any of them is faulty. N8181-58 Redundant fan unit cannot be installed together withN8104-402 water-cooling heat sink.Front fan (factory-installed) Front fan (Option A)PCI/HDD cage fan (Option B)Rear fan(factory-installed)Rear fan(Option A)
