LEV Testing and Local Exhaust Ventilation Inspections: Ensuring Better Air Quality in the Workplace

Maintaining clean, safe air in the workplace is not optional. For many industries, it is a legal requirement and a core part of protecting staff, visitors and the wider environment. 

Local Exhaust Ventilation (LEV) systems play a vital role in removing harmful airborne contaminants at source, but they only work effectively when they are properly designed, installed and regularly tested.

Sigma Engineering provides professional LEV testing and local exhaust ventilation inspections for commercial and industrial clients across Glasgow and Central Scotland. Based in Irvine, Ayrshire, the company designs, manufactures, installs and maintains highly efficient, environmentally responsible ventilation systems built to last.

What Is Local Exhaust Ventilation?

Local Exhaust Ventilation is a mechanical system designed to capture dust, fumes, vapours, grease or mist at the point they are produced. Instead of allowing contaminants to spread through a building, LEV systems extract them directly, protecting indoor air quality and reducing exposure risks.

LEV is commonly used in commercial kitchens, manufacturing facilities, workshops, laboratories and industrial settings. Systems often include hoods, ductwork, fan systems and discharge points such as anti-vandal weather louvres, all working together to remove contaminated air safely.

Why LEV Testing and Inspection Matters

Over time, ventilation systems can lose efficiency. Fans wear, ductwork becomes blocked and airflow levels change. Without regular inspection and testing, a system may no longer provide adequate protection, even if it appears to be running.

In the UK, the Control of Substances Hazardous to Health (COSHH) regulations require most LEV systems to be thoroughly examined and tested at least once every 14 months. These inspections confirm that the system is performing as intended and continues to protect workers from harmful airborne substances.

Failure to carry out LEV testing can result in non-compliance, enforcement action and increased health risks. More importantly, it can compromise the wellbeing of people using the space every day.

Sigma Engineering’s Approach to LEV Testing

Sigma Engineering takes a practical, engineering-led approach to LEV inspections. Our ventilation engineers understand how systems work in real environments, not just on paper.

Each LEV test includes a thorough examination of airflow performance, fan systems, duct integrity and capture effectiveness. Where issues are identified, clear recommendations are provided, focusing on achievable improvements rather than unnecessary replacements.

Because Sigma Engineering designs and manufactures bespoke ventilation systems, they are well placed to assess both standard and custom-built installations. This experience ensures inspections are accurate, relevant and grounded in real-world performance.

Supporting Indoor Air Quality Across Glasgow and Central Scotland

Poor indoor air quality affects productivity and our comfort and long-term health. In commercial buildings, especially those with high heat loads or airborne contaminants, ventilation systems must work efficiently to maintain safe conditions.

Sigma Engineering supports businesses across Glasgow and Central Scotland with solutions that go beyond basic compliance. From kitchen extract systems in busy hospitality environments to industrial LEV systems and fan installations, our work is tailored to the demands of each site.

By focusing on high-efficiency ventilation and effective local exhaust capture, Sigma Engineering helps clients create cleaner, safer workplaces while reducing unnecessary energy use.

Environmentally Responsible Ventilation Systems

As stewards of the environment, Sigma Engineering places sustainability at the centre of every project. Efficient ventilation is not just about the movement of air. It is about moving the right amount of air, in the right way, using best-in-class technology.

Well-designed LEV and extract systems reduce energy waste, minimise heat loss and extend equipment lifespan. This approach supports corporate environmental goals while lowering running costs over time.

From eco-friendly fan systems to durable, anti-vandal weather louvres designed for long-term outdoor performance, Sigma Engineering delivers solutions that balance performance with environmental responsibility.

Bespoke Systems for Corporate Clients

No two workplaces are the same. Off-the-shelf solutions rarely provide the best results, particularly in complex commercial or industrial environments.

Sigma Engineering works closely with corporate clients to design bespoke ventilation and local exhaust systems that meet operational needs, regulatory requirements and sustainability targets. Whether installing new systems or inspecting existing infrastructure, the focus is always on long-term performance and reliability.

Their in-house capabilities allow for tailored designs, precision manufacturing and professional installation, ensuring each system integrates seamlessly with the building and its use.

Why Choose Sigma Engineering for LEV Inspections?

Choosing the right partner for LEV testing is about more than ticking a compliance box. It requires technical expertise, clear communication and a commitment to quality.

Sigma Engineering combines hands-on engineering experience with a strong environmental ethos. Based in Irvine, Ayrshire, their team works across Glasgow and Central Scotland, delivering dependable ventilation solutions for businesses that value safety, efficiency and sustainability.

From local exhaust ventilation inspections to complete ventilation system design and installation, Sigma Engineering provides a trusted, end-to-end service that keeps workplaces compliant and air quality under control.

For more information, don’t hesitate to contact our team today.