<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/#comment-138947>
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"Since others have done this...what would be a suitable make/model for UMO fan?  (Not +) \nMy Original fan has a bad bearing...usable but noisy.  And I want a second to add additional cooling on the right side. \nI have been looking for a Y adapter to attach two 2-wire fans but have not found such a device yet.   \nI assume the replacement fan needs to be able to do PWM? \nEdit:  Would two of these, spliced together, work? "
<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/?tab=comments#comment-103299>