What is the primary purpose of the ventilation system at a fuel dispensing facility?

The primary purpose of the ventilation system at a fuel dispensing facility is to ensure safety by managing potentially hazardous vapors that can accumulate during fueling operations. This includes the release of gasoline vapors, which are not only toxic but also flammable. The ventilation system plays a critical role in maintaining safe air quality by exchanging indoor air with fresh outdoor air, thereby reducing the concentration of vapor.

While the other choices may touch on related aspects of a ventilation system's broader role, they do not capture its primary function as effectively. For instance, while improving air quality could be a secondary benefit, it is not the specific aim of the ventilation system in this context. Heating is not a function associated with fuel dispensing facility ventilation systems, as their design focuses on air exchange rather than temperature control. Emergency evacuations may involve other measures, but the ventilation system itself is not designed to facilitate evacuation; instead, it focuses on preventing dangerous vapor build-up during the fueling process.