What Is LEV


Thousands of British workers contract occupational asthma and other lung diseases each year. Many people die or are permanently disabled by these conditions and are unable to work. People develop these diseases because they breath in too much dust, fume or other airborne contaminants at work, often because control measures don't work well enough.

Most industries are affected, including woodworking, welding, paint-spraying, stone masonry, engineering and foundry work.

Armstrong Environmental can advise you how to control gas, vapour, dust, fume and mist in workplace air using local exhaust ventilation (LEV) - extracting clouds of contaminant before people breath them in.


LEV is an engineering control system to reduce exposures to airborne contaminants in a workplace.


Most systems, but not all, have the following:


This is where the contaminant cloud enters the system.


This conducts air and the contaminant from the hood to the discharge point.

Air Cleaner:

This filters or cleans the extracted air. 

Air Mover:

The 'engine' that powers the extraction system, usually a fan.


This releases the extracted air to a safe place.



Common elements of a simple LEV system



(Source – HSE website www.hse.gov.uk)









Office Address

Armstrong Environmental Ltd
Unit 13, City West Business Park


0191 378 2164
© 2013 Armstrong Environmental Ltd. All rights reserved.
Company No: 6317253 VAT: 916 043
Registered Office: Quarryburn House, 15 Quarryburn Lane, Hunwick, County Durham 
DL15 0RE
Website by tr10.com