Cisco NCS55A1 Hardware Installation Manual page 32

Install the Air Filter
In general, we recommend that you inspect the air filter every three months and replace, if necessary,
Note
every 6 months.
If air filters need replacement, follow this procedure.
Step 1
Install the air filter on the port side inlet as follows:
a) Using two hands to support the air filer, orient it so that the ridge on the front of the air filter faces outward from the
front of the chassis and the wire-grid backing support is facing up.
Figure 12: Port side Inlet Air Filter
b) Slide the air filter into the air filter slot until it is seated fully within the slot.
c) Hold the filter cover plate in place and tighten the middle panel to the top and bottom panels with six thumb screws.
And, tighten the top and bottom panels separately to the faceplate using four screws.
Step 2
Install the air filter to the port side exhaust as follows:
Hardware Installation Guide for Cisco NCS 5500 Series Fixed-Port Routers
24
Install the Chassis