Cisco 2811 Router Fan1/Fan2 Replacement, ACS-2811-FAN-1/2=Don’t let your network overheat. Cool your router down with our high-quality Cisco 2811 Router Fan1/Fan2 Replacement, ACS-2811-FAN-1/2=. This replacement fan is compatible with the Cisco 2811 router. You can even use it to replace either “Fan 1” or “Fan 2” as needed. That means you can keep them in stock for whenever disaster strikes. *This part number is for ONE fan.*