What type of ventilation system is utilized for specific contaminant sources?

Local exhaust ventilation is the correct choice because it is specifically designed to capture and remove contaminants at or near their source before they can disperse into the work area. This type of system is particularly effective in environments where hazardous substances are generated, such as dust, fumes, vapors, or other airborne particulates. By focusing on specific sources of contamination, local exhaust ventilation helps maintain air quality and protect the health of workers by minimizing their exposure to harmful substances.

In contrast, general ventilation serves to circulate air throughout an entire space and is not aimed at specific contaminant sources. While fresh air systems provide clean air to an environment, they do not necessarily address contaminants directly at their source. A pressure differential system maintains varying air pressures in different spaces to control the flow of air but does not specifically target areas where contaminants originate.