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Some components in the image may not reflect the actual server, but fan polarity remains consistent.
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Fan 0 is the left fan.
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Fan 1 is the right fan.
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Alternatively, the Open Compute V3 midplane board has fan polarity silskcreens. These are located near the fan power connectors.
 
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                                          Almost done!                  
                  This work is licensed under a Creative Commons Attribution 4.0 International License.
                                          Conclusion                  
                  This work is licensed under a Creative Commons Attribution 4.0 International License.