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Local exhaust ventilation (LEV)
workplace fume and dust extraction

Lines showing dust/gas particle flow

Every year, thousands of workers in Britain develop occupational diseases from breathing in certain dusts, fumes or other airborne contaminants at work.

Local exhaust ventilation, often called dust and/or fume extraction, can help clean the air, before people breathe in these harmful substances.

LEV calculations

Useful calculator for LEV surveyors: conversions, averages, volume flow, air change rate, air density and air velocity.

View and use calculator


Find out information about LEV events that HSE and other organisations are running.

View upcoming LEV events


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Updated 2012-11-06