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It's somewhere written down in the comments here... But I added it to the thing description now:

I use and recommend Leo's Mistral 2 or the Anet A8's stock fan duct. With the Mistral you should rotate the heater block in a way that the shortest extent points to the fan.

(Another option would be to determine the offset in x, y, z direction of your beloved (semi-)circular fan duct to the nozzle and then insert them in the expert settings in the CUSTOMIZER to fit the mount!)

"Mistral 2.1" Extruder Cooling Duct for the Anet A8 Printer
by Leo_N