Cisco NCS 560-4

There are three fan tray field replaceable units (FRUs) in the chassis: two slave fan trays (top two fan trays)
and one master fan tray (at the bottom left of the router).
Figure 2: Fan Trays On the Left Side of Router
Dust Filter (N560-4-FILTER)
The dust filters (set of two filters) are located on the right side of the chassis and prevent dust from entering
the chassis.
Cisco NCS 560-4 Router Hardware Installation Guide
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Cisco NCS 560-4 Router Overview
Fan Trays