Hot end fan volts

I am in the processes of completely redoing extruders on my cube two I need to know the fan volts for the extruder I am putting on J style hot ends and bowden filament driver remotely the new hot ends come with 30mm fans at 12v just need to know the voltage for the fans
Thanks Dennis

If it is previous year model I believe they are 24V. but you can double check by open the bottom cover to look at the power supply info