I’m not alone in noting that, especially in summer, the first recent pour of homebrew tends to be foamy at first. Part of the problem is that the beer in the draft tower cools down so that the CO2 in it becomes less soluble and tends to come out immediately. Today I set up a fan to blow cool air into the draft tower to try keep the beer in the draft tower cooler.
I used a fan from a dead old Mac Mini and a 5V power supply from a Ye Olde Palm Treo, soldering a 2.1mm barrel plug and socket to make it dis-connectable.
The fan is rated for 12V and the power supply is 5.2V. I tried a higher voltage power supply and it did blow a lot more air, but subjectively the fan blew hard enough on the lower voltage supply, and it was definitely quieter.
I was able to run the power cord out through the drain port at the bottom of the fridge as seen here.
Here’s another shot of the installed fan with both kegs in the fridge.
I used safety wire hold it in place.