Local Exhaust Ventilation

Local exhaust ventilation is an engineering system that captures dust, vapours, and fumes at their source, minimising the risk of workers breathing in contaminated air.The main principle of LEV is to remove contaminants from the air so that they cannot be breathed in. Properly designed LEV will collect air that contains the contaminants making sure that they are taken away from people. The air will then be cleaned (if necessary) and contaminants safely disposed of.Local exhaust ventilation is an extract ventilation system that takes airborne contaminants such as dusts, mists, gases, vapour or fumes out of the workplace air so that they can't be breathed in.There are two primary types of mechanical ventilation: negative pressure ventilation (NPV) and positive pressure ventilation (PPV). Negative pressure ventilation exposes the thorax to sub-atmospheric pressure, which causes breathing by sucking air into the lungs.