http://www.amazon.com/gp/product/B001JKNMBE/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1
At ambient temperature of 80-82F, this reduced the reported ant temperatures from 48/49C to 44/44C while mining at 200GH / 393.75 clock.
When the ant can no longer mine at higher difficulty, this fan will replace the stock fan on my H80i (radiator for the liquid cooler) for keep an OC-ed cpu cool
Can you clarify "added in pull mode" and "connected to second blade"?
I see a single jack for the fan. Did you just replace the factory fan with the one you are linking? With less noise I can order a couple more ants...
Stock fan pushes air into the heat sinks while the second "high cfm/static pressure" fan that I added pulls it out from the sinks. So pull -> venting outward from the ant.
Not sure if you have a single or dual S1, but the ones I got have a fan 4-pin on each blade. Only one shows in web interface but they are both running and judging by the sound, the board is controlling them as needed.
I use extra fans on the other side powered by the molex connections. Working at 100% of course.
Adds up to the electricity bill but also adds to safety