Which components are included in a typical local exhaust ventilation system?

Which components are included in a typical local exhaust ventilation system?

• A. Hood, Exhausted Enclosures, Ductwork, Air Cleaners, Fan, and Stacks
• B. Hood, Filters, and Fans
• C. Ductwork, Humidifiers, and Heaters
• D. Only Hood and Stack

Answer: (A)

Local exhaust ventilation works by capturing contaminants at the source and pulling them through a pathway to be discharged outside. A typical system includes a hood or enclosure placed near the emission point to capture the fumes, an enclosure or setup around the process to aid capture, ductwork to carry the contaminated air, a fan to create the airflow, air cleaning equipment or filters to remove pollutants, and a stack to exhaust the cleaned air to the outdoors. This combination covers capture, conveyance, filtration, and discharge, which is why the set of components listed—hood, exhaust enclosures, ductwork, air cleaners, fan, and stacks—best represents a complete LEV system. The other options miss essential parts (like ductwork or filtration) or include items not relevant to LEV (such as humidifiers or heaters) or are incomplete (only hood and stack).

Local exhaust ventilation works by capturing contaminants at the source and pulling them through a pathway to be discharged outside. A typical system includes a hood or enclosure placed near the emission point to capture the fumes, an enclosure or setup around the process to aid capture, ductwork to carry the contaminated air, a fan to create the airflow, air cleaning equipment or filters to remove pollutants, and a stack to exhaust the cleaned air to the outdoors. This combination covers capture, conveyance, filtration, and discharge, which is why the set of components listed—hood, exhaust enclosures, ductwork, air cleaners, fan, and stacks—best represents a complete LEV system. The other options miss essential parts (like ductwork or filtration) or include items not relevant to LEV (such as humidifiers or heaters) or are incomplete (only hood and stack).