Reddit mentions of StarTech.com 12in 4 Pin Fan Power Splitter Cable - F/M - 1ft Fan Y Cable - 1ft 4-pin Fan Splitter Cable (FAN4SPLIT12)

which mobo are you using?
im sure you cann use something like this:https://www.amazon.com/StarTech-com-12-Inch-Power-Splitter-Cable/dp/B005G3010U

2 case fans... May be an issue with an ITX mainboard, so check it. https://www.amazon.com/StarTech-com-12in-Power-Splitter-Cable/dp/B005G3010U may be required,

Depending on how your fans get their power, you will need some combination of these:

• Molex splitters for Molex fans $2 ea: http://www.amazon.com/Micro-SATA-Cables-Splitter-connectors/dp/B002ZUMLFA
  
• Molex to PWM converter / splitter (run several large PWM fans of the same size from one Molex connector) $7: http://www.amazon.com/Splitter-Molex-headers-CONNECT-MULTIPLE/dp/B009D3HV1Q
  
• PWM splitters (run two small PWM fans from one motherboard header) $7: http://www.amazon.com/StarTech-com-12-Inch-Power-Splitter-Cable/dp/B005G3010U
  
• Fan Speed Reducers (5-pack for silencing) $6: http://www.amazon.com/Computer-Noise-Reduce-Resistor-Adapter/dp/B00880S6KA

4 Pin Fan Power Splitter Cable

If you stay at idle, 1 fan is enough.

I see. My board has both a 4 pin and a 3 pin chassis fan slot.
Should I prioritize giving the 4 pin to specific fans on the chassis to maximize the effectiveness of that speed control pin? Like the two exhaust fans maybe?

Thanks for all the help btw. Very much appreciate it.

Do you have specific brands to refer to for fan splitters? I'm looking at this one:
https://www.amazon.ca/StarTech-com-FAN4SPLIT12-12-Inch-Power-Splitter/dp/B005G3010U

And duly noted on the 120mm phantek fans. i'll look for noctua or silent wings ones instead. but the 140mm phantek fan I chose is fine?

So if I get a splitter, I'll be able to hook up the 5 fans for the whole case?

https://www.amazon.com/12in-Pin-Power-Splitter-Cable/dp/B005G3010U

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Would that be fine?

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What do I about the CPU fan header? The cooler has 2 fans and I know MOBO's do special things for the CPU fans as far as thermals go.

Ah, indeed, that mobo has only 2 fan headers for case fans...

You've got a couple of options in that case. The easiest would be to get a 4-pin fan splitter (like this) and hook the two front intakes up to one header while the back exhaust is on the other one. Make sure to not exceed 1A current draw on a single header (look up the fans's specification for their current draw).

When expanding your system and adding fans, a fan controller might be a useful tool. This allows you to hook up a ton more fans and allows for manual control. There are also bigger splitters which hook up to the PSU, but unless you have PWM fans, this will cause the fans to run at full speed all the time, which is not really an enjoyable experience...

http://www.amazon.com/gp/product/B000FAKUE6/ref=pd_lpo_sbs_dp_ss_2?pf_rd_p=1944687602&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000BSJGL0&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0KV87R5FQ1PY7A8SAX2N

Edit: Only use this if your fan is a three pin. For a four pin you are better off with this: http://www.amazon.com/StarTech-com-12-Inch-Power-Splitter-Cable/dp/B005G3010U

http://www.amazon.com/StarTech-com-12-Inch-Power-Splitter-Cable/dp/B005G3010U
splitter!