What are the two types of applications used in a CO2 system?

The correct choice identifies the two applications of carbon dioxide (CO2) fire suppression systems: local and total flooding.

In a CO2 suppression system, 'local' applications refer to scenarios where CO2 is directed at specific hazards or areas, effectively protecting localized equipment or spaces without displacing the air in the entire room. This type is often used in situations where only certain equipment, such as electrical panels or delicate machinery, needs protection without compromising operations in other areas.

On the other hand, 'total flooding' application means that the CO2 is discharged throughout an entire room or enclosure to displace oxygen and suppress any potential fire over the entire volume. This is typically applied in larger spaces where there are multiple risks or when the entire area could be involved in a fire scenario.

Understanding these two applications is essential for appropriately designing and implementing CO2 fire suppression systems tailored to specific needs and ensuring effective fire protection strategies.