Cisco cBR Series Hardware Installation Manual page 246

Installing the Air Filter on a Card
Step 1
Hold the air filter with the orientation as shown below during installation.
Figure 155: Air Filter for the RF Line Card Orientation
Figure 156: Air Filter for the Supervisor Card Orientation
Step 2 Insert one end of the air filter at an angle under the ejector handle and slide it under the bezel filter guide rail on the card
faceplate.
Cisco Converged Broadband Routers Hardware Installation Guide
238
Maintaining the Air Filter in the Cisco cBR Chassis