My team and Iwould like to know if the fan on the Raspberry Pi PoE HAT is really necessary for its good functioning ? We are building a stratospheric balloon which we'll send in the stratosphere (around 35 km from the earth). However, at this altitude there's no heat and there's no area pressure. So, we don't think that the fan would send fresh air to refresh the motor. In short, does the fan on the Raspberry Pi PoE HAT in this case is really needful?
Also, at which temperature does the fan starts spinning and which temperature the Raspberry Pi can no longer operate?