Protecting workers from hazardous dust, fumes, and airborne contaminants is a critical responsibility for employers across the construction, manufacturing, engineering, and industrial sectors. One of the most effective ways businesses can safeguard employee health is through Local Exhaust Ventilation (LEV) systems.
However, simply installing an LEV system is not enough. To remain effective and compliant, these systems must be inspected, maintained, and tested regularly. Understanding how often LEV testing should be carried out is essential for ensuring worker safety and meeting legal obligations.
What Is LEV Testing?
Local Exhaust Ventilation (LEV) systems are designed to capture and remove harmful airborne substances before they can be inhaled by workers. They are commonly used to control exposure to dust, fumes, vapours, mists, and other hazardous contaminants generated during workplace activities.
LEV systems can be found in a wide range of industries, including construction, welding, woodworking, pharmaceuticals, food production, and manufacturing.
LEV testing, formally known as a Thorough Examination and Test (TExT), assesses whether a system is functioning correctly and providing the level of protection it was designed to deliver.
How Often Should LEV Testing Be Carried Out?
Under the Control of Substances Hazardous to Health (COSHH) Regulations, employers are legally required to ensure LEV systems undergo a Thorough Examination and Test at least once every 14 months.
This inspection must be carried out by a competent person who can assess the performance and condition of the system and identify any issues that may reduce its effectiveness.
For some specialist applications involving highly hazardous substances, more frequent examinations may be required. Employers should always refer to COSHH guidance and risk assessments to determine the appropriate inspection schedule.
Why Is Regular LEV Testing Important?
Over time, LEV systems can deteriorate due to wear and tear, damaged ductwork, blocked filters, fan failures, or changes in workplace processes.
Without regular testing, businesses may be unaware that their systems are no longer adequately controlling harmful contaminants.
This can lead to:
- Increased worker exposure to hazardous substances
- Greater risk of occupational illnesses
- Reduced system efficiency
- Potential enforcement action from regulators
- Non-compliance with health and safety legislation
Regular testing helps identify issues before they become serious problems and provides confidence that the system is operating as intended.
Construction Sector Risks
Construction environments present unique challenges when it comes to airborne contaminants. Activities such as cutting, drilling, grinding, sanding, and demolition can generate significant amounts of dust, including respirable crystalline silica (RCS).
Prolonged exposure to silica dust has been linked to serious health conditions, including silicosis, chronic obstructive pulmonary disease (COPD), and lung cancer.
With construction firms facing increasing scrutiny around worker welfare and compliance, ensuring LEV systems are tested and maintained correctly has become more important than ever.
LEV Testing Is Not a Box-Ticking Exercise
One of the most common misconceptions among businesses is that LEV testing is simply a compliance requirement. In reality, it plays a crucial role in protecting employees from potentially life-changing health conditions.
A Thorough Examination and Test not only confirms whether a system meets legal requirements but can also highlight maintenance issues, operational problems, or opportunities to improve performance.
Businesses that treat LEV testing as part of a wider health and safety strategy are often better positioned to reduce risks, improve workplace conditions, and demonstrate their commitment to employee wellbeing.
Keeping Workers Safe
While the legal requirement for most LEV systems is a Thorough Examination and Test every 14 months, employers should also carry out routine inspections, maintenance, and employee training throughout the year.
Worker health depends on more than simply installing extraction equipment. Regular testing, ongoing maintenance, and proactive management help ensure that LEV systems continue to provide effective protection long after installation.
By understanding when LEV testing should be carried out and why it matters, businesses can create safer workplaces while remaining compliant with their legal responsibilities.
