system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: car ventilation, we all know how the air gets in, but how does the old air get out?
gpt
There are gaps in panels and seals all over the body. The fans from the ventilation pressurizes the car enough to push the air out through these gaps. But just to make sure the air gets all the way to the back most cars do have vents in the rear for the air to escape. On some cars these are quite visible from the outside as well but most modern cars do keep them quite well hidden.