The only thing wiht these fans though, is that there about 37 watts of power. That's probably mostly heat. So I'll always use them for sucking, not pushing.
I suggest you dont have them blowing into the case.. deffinetly sucking.. those fans suck up 37watts... they are HIGHLY innefecient compared to DC fans.
Id imagine that a good portion of that 37watts is turned into heat and not actual power.