What is one of the uses of high velocity fog applicators?

High velocity fog applicators are specifically designed to create a barrier against heat during firefighting operations. They work by producing a fine mist that can effectively absorb heat and prevent its transfer, thereby protecting both personnel and surrounding structures from extreme temperatures. This mist can also suppress the combustion process by cooling gases and reducing the heat intensity in the vicinity of the fire.

The ability to form a protective barrier against heat is crucial in firefighting, as it helps to protect the fire crew and allows them to operate more safely and effectively. The application of high-velocity fog can help control the fire's spread and enhance visibility during risky situations.

In contrast, other options do not accurately describe the primary function of high velocity fog applicators. While some may involve elements of the firefighting process, they do not align with the specific purpose and effectiveness of these fog systems in providing heat protection.