Cisco 12410 Installation And Configuration Manual page 62

Line Card and Route Processor Overview
The blower module maintains acceptable operating temperatures for internal
components by drawing cool air through a replaceable air filter into the switch
fabric and alarm card cage, and then up through the line card and RP card cage.
Figure 1-20
Figure 1-20 Cooling Air Flow
Blower module
To ensure that there is adequate air flow to prevent overheating inside the card
cages, keep the front and back of the router unobstructed. We recommend at least
6 inches (15.24 cm) of clearance.
You should inspect and clean the air filter one time per month (more often in dusty
Caution
environments). Do not operate the router without an air filter installed.
The blower module controller card monitors and controls operation of three
variable-speed fans in the blower module. The variable-speed feature allows
quieter operation by running the fans at below maximum speed, while still
providing adequate cooling to maintain an acceptable operating temperature
inside the card cages.
Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
1-34
Chapter 1
illustrates the air flow path through the chassis.
Air filter
Room air
Cisco 12010, Cisco 12410, and Cisco 12810 Series Router Overview
Air exhaust
Line card and RP card cage
Switch fabric card cage
Power supplies
OL-11496-01