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The fan that comes with your E3D V6 is designed to run 100% of the time it cools the heatsink on the nozel. It simply goes in place of the original heatsink fan on the board. Fan 2 from what I remember. You then use the old heatsink fan as your cooling fan this will run on demand much like the old one the impeller fan, you disgard it as it has no use in this mod.