The A903-FAN-E Cisco Fan Tray with Filter is a replacement cooling component designed specifically for the ASR 900 Series routers. Engineered to meet Cisco’s performance standards, this fan tray integrates a built‑in filter that helps prevent dust and debris from entering the router’s internal chassis, supporting consistent thermal management and system reliability. The unit is a direct‑fit replacement, matching the original mounting points and connector layout for straightforward installation without the need for additional tools. By maintaining optimal airflow, the A903-FAN-E helps protect critical network equipment and extend the operational lifespan of the router.