Well I’m going to try this. I’ve ordered a new outdoor vented electronics enclosure that has a rain hood on the door. Inside the door behind the rain hood is a mount for a 120mm fan. I’ve found a 120mm 24vac fan on ebay that should do nicely. I’ve already written a perl script that utilizes the OpenSprinkler 2.1.7 firmware API that will check the raspberry pi cpu temperature and start the fan whenever the temperature is above 40C. If anyone is interested, I’ll post pictures and the script here when I’m done.