Figure 160: M40 Router Air Filter And Fan Tray; Figure 161: M40 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide

Figure 160: M40 Router Air Filter and Fan Tray

Related
Documentation
M40e and M160 Router Cooling Systems
324
The M40 router cooling system consists of separate subsystems (sets of fans and
impellers) that draw room air into the chassis to keep its internal temperature below a
maximum acceptable level. After entering the chassis, the air stream separates into
separate flows for the front and rear subsystems, and the temperature of each flow is
monitored independently.Figure 161 on page 324
airflow.

Figure 161: M40 Router Cooling System and Airflow

Exhaust for Packet Forwarding
Engine cooling
Exhaust for Routing Engine
and backplane cooling
Rear of Chassis
Exhaust for power supply
Replacing a Cooling System Component on page 350
The M40e and M160 router cooling system has the following components:
Air intake vent, air filter, and intake cover—Provide an opening for room air to enter the
router. They are located at the bottom of the chassis front, below the cable
management system, as shown in
and covers the air intake vent, preventing dust and other particles from entering the
cooling system. For maintenance and replacement instructions, see the M40e or M160
router hardware guide. The nonremovable air intake cover is located behind the air
filter and provides EMC shielding.
shows the M40 router cooling system
Upper impellers
Fan tray
Top impeller
Routing
Engine
Packet
Forwarding
Engine
Lower impellers
Power supply
and Fans
Bottom impeller
Figure 162 on page
Front of Chassis
Air intake for Packet Forwarding
Engine cooling
Air intake for Routing Engine cooling
Air intake for power supply cooling
326. The air filter is removable
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