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I have never recommended using the OEM 4010 fans. The ducts for the 4010 were created for several users who kept asking for a cooling duct for a 4010 fan. The 4010 fans simply do not push enough air across the nozzle, it will not get enough air over to the second duct. I recommend using 5015 (sealed bearings) radial fans or larger. you can run these at lower speeds, get more air across the nozzle tip and have a quieter cooling solution all in one. The height to set the bottom of the cooling duct tips will depend on the type and height of the nozzle you have in your hot-end. This is why I give a range of 1mm to 2mm. I set mine at 1.2mm to 1.4mm above the bed.