I'm afraid I just can't keep my rig cool. I've 4 rigs with 3x6990's in each. At the moment I am using the fan above to just blow down recirculated air. I had the input coming from the attic but that didn't make much of a difference. I was using flexible ducting.
I am thinking of feeding the fan above from a sewage pipe from outside or getting a big 24" or 30" inch industrial type blow fan. Again this will be recirculating air as the fan makes it cool when blowing doesn't it?
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)
Any advice appreciated. Keeping an eye on these temps is a full time job.