How much did the temperature drop after completing the wind tunnel setup? (both ambient temp and the GPU temps) Nice setup with the racks, nice and compact. 
The temps run from mid 50C to 65C mostly. The last row on the top is the hottest around 72C. My room is now a livable 77 without A/C. But I still have 7, 1070s that arn't in that wind tunnel heating up my room to get that temp.