However, the results are often viewed too simply – reduced to a basic pass or fail outcome.
In reality, LEV reports provide much more insight into how well a system is performing and whether it is likely to remain effective in day-to-day operations.
Why lev testing is more than a compliance exercise
LEV systems are designed to capture airborne contaminants at source, preventing them from entering the breathing zone of workers. Regular testing is a legal requirement and helps confirm that the system is functioning as intended.
But while testing verifies performance at a specific point in time, it does not guarantee that exposure will remain controlled in the months that follow. Treating the process as a simple tick-box exercise risks missing early warning signs of deterioration.
What a ‘pass’ result actually means
A successful test result indicates that the system met the required performance standard at the moment it was assessed. It confirms that airflow, capture efficiency and system condition were within acceptable limits on that day.
However, LEV performance can change over time due to factors such as:
- Wear and tear on components
- Blockages or filter loading
- Changes in processes or materials
- Variations in how the system is used
For this reason, a pass should be seen as a snapshot rather than ongoing assurance of effective control.
Interpreting borderline results
Results that sit only just above minimum thresholds should be treated with caution. While technically compliant, they can indicate that the system is already under strain or beginning to decline.
Common underlying issues may include:
- Partial obstructions within ductwork
- Worn or poorly performing components
- Design limitations that restrict performance
- Subtle changes in the working process
Identifying and resolving these early is usually far more straightforward than addressing a complete system failure later.
Looking beyond the numbers
The numerical data in a test report is only part of the picture. Observations and comments recorded during the inspection often provide valuable context about how the system is actually performing.
These may highlight issues such as:
- Poorly positioned extraction points
- Damaged or ineffective ducting
- Inconsistent use of controls by operators
- Temporary adjustments that affect airflow
Understanding these qualitative insights can help explain why performance may be deteriorating, even when test figures appear acceptable.
Key questions to ask after receiving your report
To get real value from LEV testing, it is important to review results critically rather than simply filing them away.
Consider asking:
- Has the work process changed since the system was installed?
- Are operators using the extraction consistently and correctly?
- Is maintenance planned and preventative, or reactive?
- Does the system still match the demands of the current task?
These questions help bridge the gap between test data and real-world performance.
Integrating lev results into everyday operations
LEV systems do not operate in isolation – their effectiveness is closely linked to how they are used and maintained.
Regular communication between site teams, maintenance staff and managers can help ensure that:
- Identified issues are addressed promptly
- Systems are used as intended
- Changes in processes are reflected in control measures
- Training is updated where necessary
Using test results as a starting point for discussion encourages continuous improvement rather than periodic compliance.
The wider context: exposure control and health protection
LEV testing plays an important role in controlling airborne contaminants, but it is only one part of a broader strategy. Effective exposure management also depends on work practices, training and other control measures.
Relying solely on test results without considering how work is carried out in practice may leave gaps in protection. A more holistic approach ensures that risks are properly understood and managed.
Getting the most value from LEV testing
To maximise the benefit of LEV assessments, organisations should:
- Review both numerical results and written observations
- Act on recommendations without delay
- Monitor system performance between formal tests
- Encourage feedback from operators using the system
- Reassess controls when processes change
This approach helps ensure that systems remain effective throughout their lifecycle.
Key takeaway
LEV test results provide far more than a simple pass or fail outcome. When interpreted properly, they offer valuable insight into system performance, potential weaknesses and opportunities for improvement.
By treating these assessments as part of an ongoing risk management process, organisations can better protect workers, maintain compliance and ensure that exposure control measures remain effective over time.
