Final answer:
The exact percentage of the perimeter that should not be enclosed for a vehicle fuel dispenser under a canopy is not specified, but it is important for safety and ventilation standards that the perimeter remains predominantly open.
Step-by-step explanation:
The question pertains to the design and safety standards of a vehicle fuel dispenser, specifically one that is installed under a weather shelter or canopy. Ensuring adequate ventilation for these fuel dispensers is crucial for preventing the accumulation of fuel vapors, which can be hazardous. While the exact percentage of the perimeter that should not be enclosed is not provided in the information here, such regulations typically require that the perimeter remain predominantly open to allow for appropriate air flow.
For example, it might be stipulated that the fuel dispenser should not have more than a certain percentage of its perimeter enclosed to maintain safety standards. This ensures that there is sufficient ventilation around the dispenser. In the 1980s, the introduction of large canopy designs, as mentioned in Figure 10-21 from Fontana, CA, allowed for better access and the brightly lit canopies provided a sense of security, especially among female customers at night.