To be fair in this situation, drivers had full plastic dividers installed during Covid, which were kept afterwards; presumably because it makes them feel safer. This means that there is now a properly sealed “cab” which wasn’t the case before, so the vents in there are now much more important to keep the area cool, and probably aren’t really adequate if you seal them into a box.

In fact, thinking about it it has to be a separate system to the rest of the bus if it was Covid safe. Unless they were just expected to keep the window open? Not sure.