Cisco 7000 Series Hardware Installation And Maintenance Manual page 60

Functional Overview
If the system does shut down because of a fan failure, the system will display the following message
on the console screen and in the show environment display when the system restarts:
For complete command descriptions and instructions, refer to the related software configuration and
command reference documentation.
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Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown