I use a JT FLEX8 and initially used the JT fan, you'll hear a hum the whole time (not to bad really) but at least it's got a switch and a battery will last a number of games however it's fairly cheap, wiring will break and the fan bearings will go and make it unusable. I ended up getting a small computer fan (20-25mm I think) and hard wiring it to a 9v battery, it destroys batteries after 4-5 hours and I didn't put in a switch in but it's effectively silent.
My goggles fog up terribly after like 15-20 minutes and at least for me no anti-fog or thermal lens would help, a fan was the only thing that resolves the problem completely, and it's kind of nice having cool air blow on your face. If you can you can get away with just running the fan for a minute or 2 when you start to fog up because it clears the issue pretty quick.
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