Bus with ventilating orifice - uses depression caused by movement to draw air in and extract stale air

摘要

A bus has a passenger compartment into which air can be introduced by fresh air inlets and exhausted by an orifice at the vehicle front. This is done by depression caused when the vehicle moves. The bus has one etrance. A box containing the spare wheel is placed under the vehicle in the depression area. The box has an escape orifice for stale air and is connected to the vehicle entry. There are entrance stops and an orifice (13) is in the vertical side of one of these steps.