LEV Testing Explained: Your First Line of Defence Against Airborne Contaminants

Local Exhaust Ventilation (LEV) systems are one of the most effective ways to control airborne contaminants in the workplace — but only when they are properly designed, installed, and maintained. Under COSHH regulations, employers must ensure that exposure to hazardous substances is reduced to as low as reasonably practicable, and LEV plays a central role in achieving this. 

LEV systems work by capturing contaminants such as welding fumes, dust, vapours, and aerosols at source before they can enter the breathing zone. This not only protects workers directly involved in processes but also prevents the spread of contaminants throughout the wider workplace.

However, HSE inspections frequently identify systems that appear functional but fail to deliver adequate control due to poor airflow, incorrect hood placement, or lack of maintenance. More recently, there has been increased focus on LEV commissioning and documentation, with expectations that systems are proven effective from first use and supported by detailed performance reports. 

UK regulations require LEV systems to be thoroughly examined and tested at least every 14 months, with records kept for inspection. Failure to meet these requirements can result in enforcement action and increased health risks for employees. 

In 2026, LEV testing is not just a compliance exercise — it is a critical validation process that ensures exposure controls are working as intended. For organisations managing airborne hazards, regular testing provides both legal assurance and practical confidence in workplace safety.

Book a consultation with our LEV specialists. To discuss your LEV testing requirements or arrange a site visit, contact Sysco Environmental Ltd today. We're here to ensure your ventilation systems are effective, compliant, and keeping your workforce safe.