How fan should be used


?A chassis must use fan modules with the same airflow direction.
?A chassis must use fan modules of the same series.
?A chassis can work properly only when two fan modules are running. If one of fan modules is removed from the chassis, reinstall it into the chassis within 3 minutes.

Other related questions:
How to change fan for metro500
Metro500 is intergrated subrack ,you need change complete subrack even fan failure only

Method used to adjust the fan speed
In the NE Explorer, choose Configuration > Fan Attribute. In the right-hand pane, select Adjustable Speed in Fan Speed Mode. Then set Fan Speed Level as required. You are advised to select Auto Speed in Fan Speed Mode.

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