I used this article to decide:
https://bitmain.zendesk.com/hc/en-us/articles/204199879-Antminer-S4-fan-specification-and-possible-replacement-fans
I ended up going with the "Sanyo Denki SunAce 120 9GV1212P1J091". If it turns out to be to cheap or i don't like it I will order one of the delta fans. This one was just the cheapest but still had good RPM. I should have it midweek.
If you swap the new fan to one of the fronts, you can replace it with a Corsair SP120 with almost no impact to cooling. The rear fans are doing most of the work in this arrangement. Might be easier to obtain for some.
I wouldnt recommend those fans i had them in one of my s4' when i bought it and temps got in the high 60's and 70's. Really bad recommendation.
Which fans are you referring to? The sanyo or the corsair?
The Sanyo...
So your saying the sanyo even with extra RPM got your S4 to heat up?
No! notice qoutes above are from diff people. Sanyo is good just loud. I caution against Corsair SP120.
Thank you for clarifying! I was just making sure. The machine I put the sanyo in seems 2 run hotter then other's. Seems sanyo is doing more cooling with it's extra RPM.