What is Local Exhaust Ventilation (LEV) and when is it preferred?

What is Local Exhaust Ventilation (LEV) and when is it preferred?

• A. A capture-at-source ventilation system; preferred for high-concentration or nuisance dust tasks to minimize exposure.
• B. A dilution ventilation system for entire room.
• C. A stationary filter for general air cleaning only.
• D. The use of PPE as primary means.

Answer: (A)

Local Exhaust Ventilation is an engineering control that captures contaminants at the point they are generated, using a hood or enclosure connected to a ducted exhaust with a fan. By pulling air away from the worker’s breathing zone, it removes most of the dust, fumes, or vapors before they disperse into the room. This makes it the best option for tasks that produce high concentrations or nuisance dusts, because it directly limits exposure at the source rather than waiting for the contaminants to dilute in the entire workspace. It’s more effective than relying on general room air changes, and it’s not simply a general air-cleaning filter. PPE alone is not the primary exposure control when LEV is feasible.

Local Exhaust Ventilation is an engineering control that captures contaminants at the point they are generated, using a hood or enclosure connected to a ducted exhaust with a fan. By pulling air away from the worker’s breathing zone, it removes most of the dust, fumes, or vapors before they disperse into the room. This makes it the best option for tasks that produce high concentrations or nuisance dusts, because it directly limits exposure at the source rather than waiting for the contaminants to dilute in the entire workspace. It’s more effective than relying on general room air changes, and it’s not simply a general air-cleaning filter. PPE alone is not the primary exposure control when LEV is feasible.