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Revision to Connecting and configuring fans

David Crocker

== Caution ==
Fans are polarised. When connecting a fan to a fan connector, the positive wire (usually red) must be connected to the VFAN pin of that connector. The negative wire (normally black) must be connected to the FAN- pin if it is a controlled fan connector, or the GND pin if it is an always-on fan connector.''' If you connect the fan the wrong way round, you may damage the fan, the Duet, or both.'''
== Overview ==

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