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Local Exhaust Ventilation (LEV) systems are engineered to capture contaminants directly at their source, reducing worker exposure and maintaining compliance with occupational safety requirements. These systems are widely used in industrial environments where welding fumes, dust, chemical vapors, or particulate emissions are generated. Their effectiveness lies in limiting the dispersion of pollutants before they spread into the wider workspace.
What is LEV extraction?
LEV extraction refers to a targeted ventilation method that removes hazardous airborne substances at the point of emission. Unlike general ventilation, which dilutes contaminants throughout the environment, LEV focuses on immediate capture. This approach improves air quality, reduces health risks, and provides consistent control over emission points with predictable performance.
A standard LEV system typically includes a hood or capture device, ducting, an air-cleaning unit, and an exhaust fan. Each component contributes to maintaining adequate airflow and ensuring that contaminants are efficiently removed. System design varies depending on the type and concentration of pollutants, as well as the specific processes carried out within the facility.
Difference Between LEV and General Ventilation
General ventilation is intended to refresh indoor air by dilution. While useful for temperature control or odor reduction, it is not sufficient for managing hazardous fumes or high concentrations of airborne particles. LEV, on the other hand, directly extracts contaminants before operators can inhale them, offering a more reliable and regulated solution for occupational exposure control.
Applications of LEV Systems
LEV systems are implemented across multiple sectors, including metalworking, chemical processing, pharmaceuticals, woodworking, and food manufacturing. Typical applications include extraction of welding fumes, dust from sanding or grinding, vapors from solvents, and airborne particles from additive manufacturing. The adaptability of LEV solutions allows integration into fixed workstations or mobile configurations, depending on operational needs.
Portable LEV for Welding
Portable LEV units provide flexibility in environments where welding tasks are performed at varying locations. These mobile systems are designed to capture fumes directly from welding points, ensuring effective protection even in areas where fixed extraction systems are impractical. Their compact structure, combined with high-efficiency filtration, makes them suitable for maintenance work, small workshops, and temporary welding stations.
Choosing the Right LEV Solution
Selecting an LEV system requires an evaluation of process characteristics, contaminant types, airflow requirements, and regulatory obligations. Routine inspection and maintenance are essential to ensure stable performance over time. When correctly implemented, LEV extraction contributes significantly to workplace safety, operational efficiency, and environmental compliance.