I have an R5. Love this case. All my inlet fans are filtered!
4670K overclocked to 4.6GHz, and cooled by a Corsair H90. Ran this same setup when I was using the stock cooler, just not as overclocked. I have the stock two fans that came with the case on the inlet in the front, 2 120mm fans (leftovers from last case) as inlets on the bottom in front of the PSU. The bottom is your friend! It's filtered, too. And then I have the H90 blowing straight out of the back. Temps on my CPU never get above 70 C. I don't have any top "modu-vent" things open, as I set stuff on the top of my case. I have the PSU with the inlet fan on the BOTTOM, pulling in fresh air, and exhausting it externally--not in the case.
Give me a shout if you have any questions, or want a picture.