Associate Safety Professional Practice Exam

What is the purpose of local exhaust ventilation?

1. To cool machinery

2. To remove contaminants at their source

3. To increase airflow in a room

4. To provide fresh air to workers

The correct answer is: To remove contaminants at their source

The purpose of local exhaust ventilation is to remove contaminants at their source, which helps to protect workers from exposure to harmful substances. This system is specifically designed to capture airborne pollutants—such as dust, fumes, vapors, or smoke—before they can disperse into the general workspace. By strategically placing exhaust hoods or capturing devices close to the source of contamination, local exhaust ventilation efficiently directs these harmful particles away from the breathing zone of workers, thereby minimizing the potential for inhalation and related health risks. In contrast, cooling machinery, increasing airflow in a room, or providing fresh air to workers are not the primary functions of local exhaust ventilation systems. While improved airflow and fresh air introduction are essential for maintaining a safe and comfortable work environment, local exhaust ventilation specifically targets the immediate control of hazardous airborne substances, distinguishing its critical role in occupational safety.