What is LEV Testing? How does a LEV system work?

Local Exhaust Ventilation (LEV) systems play a vital role in safeguarding workers from harmful airborne contaminants like dust, fumes, and vapors. Regular LEV testing ensures these systems function effectively, protecting employee health and complying with legal standards. Here’s what you need to know about the process and importance of maintaining fume extraction systems.

What Are LEV Systems?

LEV systems (Local Exhaust Ventilation) are designed to capture hazardous particles at their source before they spread into the workplace air. Commonly used in industries like manufacturing, welding, and chemical processing, these fume extraction systems remove contaminants such as:

Dust from cutting or sanding.
Welding fumes.
Chemical vapors.
Gases.
By controlling exposure, LEV systems reduce risks of respiratory illnesses, skin irritation, and long-term health issues. Also Read: The Importance of a Fume Extraction System for Welding Safety

Why is LEV Testing Required?

Under UK health and safety regulations, employers must ensure LEV systems are tested by a competent examiner at least every 14 months. This lev testing verifies that the system:

Operates at peak efficiency.
Captures contaminants effectively.
Complies with Health and Safety Executive (HSE) guidelines.

Failure to comply can result in fines, legal action, or increased workplace hazards.

How LEV Systems Work

A local exhaust ventilation system has three main components:

Hood: Captures contaminants at the source (e.g., welding arc, grinding station).
Ducting: Transports contaminated air to a filter.
Filter/Scrubber: Removes harmful particles before clean air is recirculated or released.

For example, in welding, fume extraction systems use hoods placed near the workpiece to suction fumes directly, preventing inhalation.

The LEV Testing Process Explained

LEV testing involves a thorough inspection by a qualified examiner to ensure the system meets safety standards. Here’s how it works:

1. Visual Inspection

Check hoods, ducts, and filters for damage, blockages, or wear.
Ensure all components are securely fitted and functioning.

2. Performance Testing

Measure airflow velocity at the hood to confirm it meets design specifications.
Test filter efficiency.

3. Comparison to Standards

Compare results to the system’s original commissioning report and HSE guidelines.
Identify deviations (e.g., reduced airflow due to clogged filters).

4. Reporting

The examiner provides a detailed report outlining:
- Test results.
- Recommended repairs or upgrades.
- Compliance status.
Employers must retain this report for at least 5 years.

Who Can Perform LEV Testing?

Testing must be done by a competent person with:

Formal training in LEV systems.
Knowledge of HSE regulations.
Experience in assessing fume extraction systems.

Maintaining Your LEV System

To keep local exhaust ventilation systems effective between tests:

Clean or replace filters regularly.
Inspect ducting for leaks or corrosion.
Train workers on proper use (e.g., positioning hoods correctly).

The Consequences of Poor LEV Maintenance

Neglecting lev testing or system upkeep can lead to:

Increased worker exposure to harmful substances.
Legal penalties for non-compliance.
Higher long-term costs due to equipment failure.

Final Thoughts

Regular LEV testing is not just a legal requirement—it’s a critical step in protecting employee health and maintaining productivity. By ensuring your fume extraction systems function optimally, you create a safer workplace and avoid costly violations.

For industries relying on local exhaust ventilation, partnering with qualified examiners and prioritizing maintenance is key to long-term success.