Which statement best describes an advantage of local exhaust ventilation?

Which statement best describes an advantage of local exhaust ventilation?

• A. Increased energy use due to large plumes
• B. Air volume: Much less air must be moved
• C. No effect on contaminant dispersion
• D. Requires more workers to operate

Answer: (B)

Local exhaust ventilation captures contaminants right at the source, so only the air near that emission point needs to be moved through the system. That targeted capture means you can use much less total air—smaller fans, smaller ducts—and still achieve good control over exposure. In other words, the main advantage is energy efficiency driven by moving less air while keeping contaminants from spreading into the room. If contaminants were allowed to plume into the workspace, the system would have to handle more air and the energy use would rise for dilution and removal. It also doesn’t require more workers to operate; LEV is designed to protect workers with focused, efficient capture.

Local exhaust ventilation captures contaminants right at the source, so only the air near that emission point needs to be moved through the system. That targeted capture means you can use much less total air—smaller fans, smaller ducts—and still achieve good control over exposure. In other words, the main advantage is energy efficiency driven by moving less air while keeping contaminants from spreading into the room. If contaminants were allowed to plume into the workspace, the system would have to handle more air and the energy use would rise for dilution and removal. It also doesn’t require more workers to operate; LEV is designed to protect workers with focused, efficient capture.