In order to give my voron 2 more cooling power, I use a 120 fan instead of the original 4020 fan. You have to source a pipe of 1 meter long, outer diameter 18mm, inner diameter 17mm, I use a pipe used for air conditioner. Of course you have to source a 120 centrifugal fan, the fan size is big, so I mount it on the back of the printer, the pipe go through the exhaust housing, connected to the print head, so no extra weight to the print head.