Name: Cisco 4351 ISR
Brand: Cisco
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Hardware Installation Guide for the Cisco 4000 Series Integrated Services Router

OL-32185-02

Chapter 1 Overview of Cisco 4000 Series ISRs

Hardware Features of Cisco 4000 Series ISRs

Fans, Ventilation, and Airflow

Chassis Ventilation

Router and chassis temperature is regulated with internal fans. An onboard temperature sensor controls

the fan speed. The fans are always on when the router is powered on. Under most conditions, the fans

operate at the slowest speed to conserve power and reduce fan noise. When necessary, the fans operate

at the higher speeds under conditions of higher ambient temperature. To replace Cisco 4451 ISR,

Cisco 4431 ISR, and Cisco ISR4351 fan trays, see the “Replace a Fan Tray” section on page 6-53.

Figure 1-26 shows Cisco 4451 ISR airflow, Figure 1-27 shows Cisco 4431 ISR airflow, Figure 1-28

shows Cisco 4321 ISR airflow, and Figure 1-29 shows Cisco 4221 ISR airflow.

Figure 1-26 Cisco 4451 ISR Airflow

Figure 1-27 Cisco 4431 ISR Airflow

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Cisco 4351 ISR Specifications

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