What does the fan accomplish? I've seen those and dismissed them as gimmicks.
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The fan is under the coil and pushes the incoming air from the vents up to the coil and to the mouthpiece. Even with a light draw you get all of the vape. They have been working well for me. Seems to affect the taste. I can taste the separate leaves that I missed on some juices.
At first I thought there wouldn't be any difference between a regular draw and a fan assisted draw. I was surprised at the difference and couldn't figure out why. I think it might be something to do with how fast the coil heats up. Like sometimes a cooler vape taste better than a warmer one. The fan is pushing the air as the coil heats up so the process takes longer for a warm vape.
I don't know if that makes any sense but it's the best I can figure out at this point.