Local Exhaust Ventilation Testing

Local Exhaust Ventilation (LEV) systems which are being used to control workers exposure to hazardous substances need to be tested to ensure they are effective. This is not just from an engineering perspective based on system performance criteria we also need to take into account the worker doing the task. Is the LEV system capturing contaminants at source and helping to protect the worker from exposure to hazardous contaminants? If not, what are the deficiencies and how are they remediated to ensure the health of your workers?


Local Exhaust Ventilation (LEV)


In the UK companies have a legal duty to comply with requirements for testing LEV systems used to control worker exposures to hazardous substances. The COSHH Regulations, Regulation 9. The maximum time between these tests is set down in these regulations. For most industries this is given at a maximum of 14 month intervals. In practice it’s more realistic to look at testing annually.


Diamond can carry out professional testing on LEV systems to assess their effectiveness at controlling worker exposures to airborne contaminants. We can identify any deficiencies and offer solutions based on our extensive experience in Occupational Hygiene. Ultimately the aim is to ensure that any LEV provided as a control measure to protect workers’ health works effectively minimising worker exposure to hazardous substances.


As part of our professional training portfolio Diamond deliver the BOHS P601 Initial Appraisal and Thorough examination and Testing of LEV. The Management of Health and Safety at Work Regulations 1999 in the UK require that an employer must ensure that the person carrying out LEV testing is competent. One way for clients to be reassured their in house testing employees meet this criteria is to ensure that the person undertaking the test has passed BOHS Proficiency Module P601.


For more information on LEV systems for controlling worker exposure to hazardous substances (UK)




HSE web site




HSG 258 – “Controlling Airborne Contaminants at Work”



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