Without regular
Local Exhaust Ventilation (LEV) testing, system performance can decline over time, increasing the risk of exposure and non-compliance.
But how often should LEV systems be tested to ensure that they’re continuing to effectively remove any harmful dust, fumes, vapours, and other airborne contaminants?
What is the required frequency for LEV testing in the UK?
Health and safety law says an employer must assess the risks to their workers from hazardous substances – for example, dusts, fumes, vapours – and decide what measures to take to protect their health.
LEV testing is a legal requirement in the UK, and
Control of Substances Hazardous to Health Regulations (COSHH) 2002 (specifically, Section 9) states employers should arrange a thorough exam and test at least every 14 months.
COSHH regulation 9 is a minimum standard, and LEV examination records must be kept for at least five years as proof of compliance.
Failure to do so may result in enforcement action, fines, and poses an increased risk to worker health.
At Pennaire, we recommend LEV testing every 12 months and a LEV inspection twice a year.
Read now: ‘How to be compliant with LEV testing regulations’
Are there exceptions to the 14-month rule for LEV testing?
While 14 months is the minimum legal requirement to ensure compliance, more
regular LEV testing is advisable in many cases.
A different LEV testing frequency is likely to be best practice in locations where:
- Highly hazardous substances are present that require closer monitoring
- Systems operate continuously, or under heavy load
- Equipment is exposed to abrasive or corrosive materials
- Previous inspections have identified performance issues
In each of those scenarios, waiting more than 14 months may be too long to guarantee your equipment’s continued safe operation.
LEV testing frequency guidelines
| Inspection Type |
Recommended Frequency |
Purpose |
| Legal requirement (COSHH Regulation 9) |
Every 14 months |
Minimum compliance with UK law |
| Best practice (Pennaire recommendation) |
Every 12 months |
Improved consistency and proactive safety management |
| Interim inspection or walkaround |
Every 6 months |
Identify early signs of wear, damage, or reduced performance |
| High-risk environments |
More frequent (case-dependent) |
Additional protection where exposure risk is higher |
| Post-repair or system changes |
As required |
Ensure system performance after modifications |
What are the consequences of non-compliance with LEV testing frequency?
Regulators require businesses to demonstrate clear evidence of regular
LEV examination and maintenance, and from a purely legal standpoint, non-compliance can result in enforcement action, including improvement notices or fines.
Within the workplace, poor compliance can lead to:
- Increased exposure to dust, fumes, and vapours
- Reduced system performance and efficiency
- Unexpected equipment failure and downtime
- Higher maintenance and repair costs
- Potential long-term health impacts for workers
In short, failing to maintain a proper LEV testing schedule increases operational risk and as well as the likelihood of legal consequences for employers.
How to stay on top of your LEV testing schedule
Best practice when it comes to local exhaust ventilation testing includes:
- Scheduling LEV tests well in advance
- Maintaining clear records of every LEV examination
- Carrying out interim checks between formal tests
- Acting immediately on recommendations from reports
- Working with a competent, qualified provider
Regular service agreements ensure testing is never missed, helping businesses stay fully compliant with COSHH regulation 9.
Do I need regular inspections of my LEV system?
Yes. Because over time, filters gradually block, airflow reduces, ductwork deteriorates, and the efficiency of the system drops. That’s why regular inspections of an
LEV system are essential to ensure its safety and efficiency.
Relying solely on occasional spot checks is not enough, because even a well-designed system can fail to protect employees adequately without regular scheduled testing and interim checks.
Read now: ‘Beyond compliance: Why six-monthly LEV inspections make good business sense’
Professional LEV testing by Pennaire Filtration
As explained above, ensuring your workplace remains safe is a key responsibility for employers.
With thorough, reliable
local exhaustion ventilation testing and expert support from Pennaire Filtration, you can have confidence that your LEV systems are working as they should.
Our industry-leading expertise is backed by a reputation for quality, precision, and regulatory compliance.
If you have questions about LEV testing, want to book a service, or need expert advice, our experienced team is here to help.
Contact us today to schedule a LEV Test 
