The 800‑23841‑01 Cisco case fan is a precision‑engineered cooling component designed for Cisco 2821 and 2851 routers. Operating at 12 V DC and drawing 0.38 A, the fan delivers reliable airflow within a compact 80 mm by 25 mm footprint. Its 3‑wire configuration simplifies installation and integration with existing router power and control circuits. Built to meet Cisco’s stringent performance and durability standards, this fan provides efficient heat dissipation for the router’s internal electronics while maintaining a low noise profile. Ideal for maintenance, upgrades, or replacement, it ensures continued optimal operation of the router’s cooling system.