Local Exhaust Ventilation (LEV) Systems Examination and Testing

LEV systems are designed to control exposure to airborne contaminants by capturing them at the point of release and transporting them away from the workplace. A typical LEV system comprises:

• Hood: Captures the contaminant at its source.

• Ducting: Transports the captured air to the air cleaner.

• Air Cleaner: Removes the contaminant from the air.

• Fan: Generates the airflow needed to move the air through the system.

• Discharge: Releases the cleaned air safely.

Properly designed and maintained LEV systems are crucial for controlling exposure to hazardous substances in various industries, including welding, woodworking, and chemical processing.

Under the Control of Substances Hazardous to Health (COSHH) Regulations, employers are legally required to prevent or adequately control exposure to substances hazardous to health. LEV systems play a vital role in meeting these obligations by:

• Protecting Health: Reducing the risk of occupational diseases caused by inhalation of harmful substances.

• Ensuring Compliance: Helping meet legal requirements and avoid enforcement actions.

• Improving Efficiency: Maintaining a clean work environment can enhance productivity and product quality.

Regular maintenance and testing of LEV systems are essential to ensure they continue to operate effectively.

LEV systems must undergo a thorough examination and test at least once every 14 months, as mandated by COSHH regulations. However, more frequent testing may be necessary depending on the nature of the work and the substances involved. 

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In addition to these formal tests, employers should carry out simple weekly visual checks to make sure hoods are correctly positioned, ducting is undamaged, and airflow indicators are working properly. These quick inspections help catch problems early and ensure the system continues to protect workers between formal examinations.

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The examination should assess:

• System Performance: Ensuring the LEV effectively controls exposure.

• Airflow Measurements: Verifying that airflow rates meet the required specifications.

• Physical Condition: Checking for wear, damage, or blockages in the system.

Employers must keep records of these examinations for at least five years.

Effective LEV testing is about more than ticking a compliance box - it’s about making sure your systems are actually protecting the people using them. When workers are exposed to airborne hazards like dust, fume, or mist, a properly functioning LEV system can make all the difference to their long-term health.

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We look at how your system is used day to day, not just how it was originally designed. We check how hoods are positioned, whether they are capturing contaminants effectively, and whether the system is being used as intended. Our reports are clear, our testing is thorough, and our advice is always practical - focused on what will genuinely help you stay compliant and keep your team safe.

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Whether you're managing a single unit or multiple systems across a busy site, we’ll give you the support you need to meet your legal responsibilities and protect your people.