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?
Any advice appreciated. Keeping an eye on these temps is a full time job.