Figure 1-41
Air flow in the USG9520 AC chassis
Cool air
Hot air
The heat dissipation system consists of the following components:
l
Two fan modules
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An air intake vent and an air exhaust vent
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An air filter
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Fans on power modules
1.3.5.2 Fan Module
This section describes the appearance, technical specifications, and speed adjustment of fans.
Appearance and Technical Specifications of Fan Modules
The fan modules of the USG9520 are located at the rear of the chassis. Each fan module has
two fans that work in 1+1 backup mode. When a fan fails, the heat dissipation system enables
the system to continue operating for a short time at the ambient temperature of 40°C. The fan
module is hot-swappable.
shows the fan module.
NOTE
The heat dissipation system allows the device to operate at the ambient temperature for a short time as
long as, at the time of failure, the system has not been operating continuously for more than 96 hours
and the accumulated operation time of the system per year does not exceed 15 days.
HUAWEI USG9500 Series
Hardware Guide
1 Hardware Overview
Issue 03 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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