Originally Posted by GeauxBrew77
I think the reasoning for the fan is just because of the type of thermostat used in plans.
That's exactly why I used the 12V (~120mm) computer fan. Well, that and also because they are very cheap! It does a great job circulating the air.
I got my "temp controller" from Home Depot. It was about ~$25. It works great.
I have some drawings and pics if you need ideas for the chamber. I did some dimensional changes to make sure it fit my fermenters.
Hope this helps.