<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/#comment-103784>
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"My new x2 24v fans work perfectly. I had to buy 2 since I did't knew the voltage of the other fan. Thank you guys! "
<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/?tab=comments#comment-103299>