Your search for "ncs-1ru-fan-fw" revealed the following:
Cisco NCS-1RU-FAN-FW NCS Series Front-to-Back Airflow Router Fan
SKU: NSB-8167
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco NCS-1RU-FAN-FW NCS Series Front-to-Back Airflow Router Fan
SKU: NSN-9478
Condition: New
Shipping: Overnight Options
Warranty: 365 days