The test run went well. I did two back to back 10 gallon batches and only had one problem, I had a temp probe mis-read, but after it was fixed no more problems. The box and heat sinks did not get too hot, I did not test the temperature but they did not get any hotter then I could touch. So, if I add a fan it will be this summer, but I must say that after a long day of brewing with an electric set up I will never go back to gas. It's nice to be able to walk away for a few minutes and not have to watch it like a hawk and it's so much quieter.