Figure out which way up you want the fan duct to sit on the HotEnd given your particular mounting arrangements. We recommend mounting it with the over-hang at the top. If you have it hanging down however, please keep it clear of the heater block.
Remove the fan duct from the HeatSink.
Screw the screws into the fan such that the ends are just protruding from the other side of the fan. The sticker of the fan must face the heatsink to blow air over the heatsink.
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