Collects Contaminant at the point of generation

Collects Contaminant at the point of generation

• A. Local Exhaust Ventilation (LEV)
• B. LEV Components
• C. General/Dilution Ventilation
• D. Measuring Velocity

Answer: (A)

Capturing contaminants at the source is what local exhaust ventilation is designed to do. By placing a hood or capture device right at the point where the contaminant is generated, the system pulls it away before it can disperse into the surrounding room air. The captured air is then moved through ductwork to be filtered or exhausted outside, keeping workers’ exposure low. This source-capture approach is more effective for controlling airborne hazards than relying on room-wide dilution, which depends on air mixing and may allow contaminants to spread before dilution occurs. Measuring velocity is a related performance check for LEV, not the function itself, and LEV components are the parts that make the system work, whereas the key idea here is the act of capturing at the generation point.

Capturing contaminants at the source is what local exhaust ventilation is designed to do. By placing a hood or capture device right at the point where the contaminant is generated, the system pulls it away before it can disperse into the surrounding room air. The captured air is then moved through ductwork to be filtered or exhausted outside, keeping workers’ exposure low. This source-capture approach is more effective for controlling airborne hazards than relying on room-wide dilution, which depends on air mixing and may allow contaminants to spread before dilution occurs. Measuring velocity is a related performance check for LEV, not the function itself, and LEV components are the parts that make the system work, whereas the key idea here is the act of capturing at the generation point.