Cisco Dust Filter (A903-FAN-F)Cisco Dust Filter (A903 FAN F) Protect your Cisco routers internal components from dust and debris with the Cisco Dust Filter, designed specifically for fan trays. This high performance filter uses a quadrafoam material with a precise 45PPI density to deliver robust filtration while preserving airflow essential for reliable cooling. With the A903 FAN F dust filter in place, you can extend the life of critical components, reduce the need for frequent