Holy man you must have some serious fogging problems. I find I only have to run the fan for about 5 minutes now and then when my googles start fogging. Sometimes I just run it for a few seconds and then turn it off.
Here are some pictures of my setup.
It was a really simple and light setup. I put the switch facing the inside of the googles. At first I thought that it was going to be a problem but its really easy to slip my finger in from the side a flick the switch.
Doesnt ESS sell a goggle fan. I dont mean the goggles with the fan built in. I mean sold serperately. I thought I saw them at some point or another. I remember they had two speed setting. Best part was they had a button you could just press and it would run the fan for a certain amount of time and then turn itself off.