LEV Testing

Local Exhaust Ventilation refers to the system of capturing dust, fume or vapour at source, using air movement to capture and convey the contaminant to a safe discharge point. Equipment installed for this purpose should, in line with COSHH regulations, be inspected at least every 14 months and records of those inspections kept on file. This is a legal requirement.

At Heaton Green, we are specialists in providing comprehensive LEV testing on the majority of extraction equipment ensuring your workers are kept in a safe environment.

Working strictly within the HSE regulations under HSG-258 guidance of LEV systems all of testing and maintenance work is completed by our competent engineers, as part of our LEV test our engineer will carry out a mechanical inspection of the installation and following our inspections a report on the condition and any maintenance work which may be required is commissioned. As part of our LEV testing service we can repair LEV systems and fit both spares and replacements at very competitive prices. 

LEV Testing / Local Exhaust Ventilation Testing
LEV Testing


LEV Testing is a legal requirement as set out in the Health and Safety at Work Act of 1974; it is designed to ensure that any ventilation equipment is working effectively and safety in order to help clean the air from possible dusts, fumes and other airborne contaminants that your employees breathe.

As set down in COSHH for most systems the legal requirement is to have an LEV test completed every 14 months; however some equipment in selected industries does require more frequent testing and if wear and tear on the LEV system is liable to mean the effectiveness will degrade between tests then examinations should be carried out more frequently.

The Testing Process

Stage 1: A thorough visual and structural examination

This is stage is to verify that the LEV is in efficient working order, in good repair and in a clean condition and may include a thorough external examination of all parts of the system, looking for damage, wear and tear, internal duct examinations, examination of any filter cleaning devices work correctly, inspection of the filter fabric and where filters have built-in pressure gauges, checks on their function and that the operating pressure is correct, checks of the water flow and sump condition in a wet scrubber, checks that the monitors and alerts/alarms are functioning correctly, inspection of the air mover drive mechanism, checks for indications of effectiveness.

Stage 2: A review of technical performance

This stage checks the conformity with commissioning or other sources of relevant information and may include observations, challenge testing, dust lamp testing, measurements, additional checks to individual components and calculations of volume flow rates.

Stage 3: Assessment of control effectiveness

The stage is to ensure that the LEV can continue to perform as intended by design and will contribute to the adequate control of exposure and includes a visual and structural examination, observations of the process and contaminant sources and he way in which operators use the LEV, challenge tests, appropriate measurements and a comparison of measurements made with any employer records of air sampling relevant to LEV performance and information on the way operators use the LEV.

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