Cisco 12416 Installation And Configuration Manual page 311

Chapter 7 Maintaining the Router
Step 2
Caution
Figure 7-11 Removing the Chassis Air Filter
Air filter
Push filter up
with palm
and fingertips
OL-11495-01
Lift up the air filter and carefully slide it out the door
Be careful not to damage the honeycomb screens on the back of the
air filter door and in the fabric card cage. Damage to the honeycomb
screens can restrict airflow, cause overheating, and affect EMI
performance.
Cisco 12016, Cisco 12416, and Cisco 12816 Router Installation and Configuration Guide
Cleaning or Replacing the Chassis Air Filter
(Figure 7-11).
7-19