Up to 2021 the refer vents were on the roof which was ideal for air flow yet some Lances, 2017 came with a fan but not all. Mine doesn't have a fan, @BobnRobin 2375 has it.
On the 2022 all vents are now on the side which has caused air flow problems so don't know if a fan is being used now. My cousins 5er, 2008, with side vents had issues when new until the dealer installed a fan.
Another thing to ask about the 2022...