Reddit mentions of ExtremeMod 4 Pin Molex to 2 x 3 Pin Male Computer Case Fan Power Connector Y-Splitter Adapter Cable

USB to 4 pin molex is super common and easy to find. Just then buy an adapter from molex to fan power

https://www.amazon.com/gp/aw/d/B00VG6UV2O/ref=mp_s_a_1_1?ie=UTF8&qid=1475254389&sr=8-1&pi=SY200_QL40&keywords=usb+to+molex&dpPl=1&dpID=41Y6G9u4zhL&ref=plSrch

https://www.amazon.com/gp/aw/d/B00DU8ZZ0O/ref=mp_s_a_1_1?ie=UTF8&qid=1475254425&sr=8-1&pi=SX200_QL40&keywords=molex+to+fan+adapter&dpPl=1&dpID=41XRRy3aZsL&ref=plSrch

There may be a cable that skips the middle man, but I have confidence that these are popular and probably work well

Will you be reversing the flow of the fans inside your UFO? From the factory they act as an intake, not exactly ideal for the top of your spacebucket.

1. 1 x 80mm should be fine for a UFO build if you flip the UFO's fans. The UFO will be responsible for most of your heat exhaust. Your climate will also dictate how much airflow is required.
   
   
2. Intake on the bottom, exhaust on the top. Anyone doing otherwise is in error. Heat rises, work with it.
   
   
3. That adaptor sure will. You'll also want one of these. It will work with all standard PC case fans
   
   
4. Yes those will work just fine. If it's too long you can just cut it shorter without having to do any rewiring.
   
   
5. No idea, never owned a UFO. Should be pretty straightforward, just go for a walk around your local hardware and see what ideas come to you.
   
   Remember buckets are a fun DIY challenge. You will need to do a bit of trial and error.

Ok, somewhat common issue with the Element case. You will need to take the rear side panel off (the metal one) and trace that wire. It will eventually plug into a molex to fan header adapter to plug the fan into the power supply.

It will look something like this product

https://www.amazon.com/ExtremeMod-Computer-Connector-Y-Splitter-Adapter/dp/B00DU8ZZ0O

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The loose end of the fan cable plugs into one of the 3 pin connectors (its keyed so it can only plug in one way) and then that should give power to the fan.

Didn't realize I need molex to 3 pin adapters for extra fans, can anyone tell if all of the ends of the cables on this adapter are male? are there any physical stores that sell these? Can I use the computer with only one fan connected to the mobo?

This would do the job
Just plug the molex into your powersuplly and the two 3 pin fans on the other side.
No connector on the motherboard needed for this!

would something like this work? https://www.amazon.com/Molex-Computer-Connector-Y-Splitter-Adapter/dp/B00DU8ZZ0O

or does your fan have something else than a 3 pin connector?

From what I read on the corsair website about that case, you could install it on the side panel as an intake for your gpu's or mount it on the top of the case as an exhaust. As for the motherboard headers, you can purchase a molex to fan adapter cable. They are relatively inexpensive. [Adapter | Amazon] (http://www.amazon.com/Molex-Computer-Connector-Y-Splitter-Adapter/dp/B00DU8ZZ0O/ref=sr_1_1?ie=UTF8&qid=1456925924&sr=8-1&keywords=molex+fan+adapter)

Get one of these.

https://smile.amazon.com/Molex-Computer-Connector-Y-Splitter-Adapter/dp/B00DU8ZZ0O

Sorry for the late response, anyhow, because the motherboard only has 1 system fan header, you may want to get either a 4 pin molex to 3pin fan adapter cable for the second case fan or a fan slitter cable:

https://www.amazon.com/SilverStone-Technology-Sleeved-Splitter-CPF01/dp/B00B46XKKQ

https://www.amazon.com/Molex-Computer-Connector-Y-Splitter-Adapter/dp/B00DU8ZZ0O/ref=sr_1_2?s=pc&ie=UTF8&qid=1483975373&sr=1-2&keywords=3pin+fan+to+molex

that or you may want to add a fan hub

https://www.amazon.com/SilverStone-System-Cables-Black-CPF04/dp/B00VNW556I