At Combined Air Limited, we invest in the highest level of professional qualifications to ensure we deliver expert LEV services. Our engineers hold the comprehensive suite of BOHS (British Occupational Hygiene Society) LEV qualifications - representing the gold standard in local exhaust ventilation competence.

BOHS Certified Engineers

P601 - Thorough Examination and Testing of Local Exhaust Ventilation Systems

The foundation qualification for LEV testing. This ensures we conduct examinations to HSG258 standards, measuring air velocities, static pressures, and system performance accurately.

P604 - Performance Evaluation, Commissioning and Management of Local Exhaust Ventilation

Advanced LEV testing qualification covering commissioning and performance management. This provides deeper analytical capability than basic P601 testing, enabling us to evaluate complex systems and commissioning requirements.

P602 - Basic Design Principles of Local Exhaust Ventilation Systems

Understanding of LEV design principles means we can identify whether poor performance stems from maintenance issues or fundamental design problems. This saves you time and money by identifying the real root cause of system failures.

P603 - Control of Hazardous Substances - Personal Protective Equipment

Expertise in PPE and respiratory protective equipment (RPE) enables us to advise on suitable protection where LEV alone cannot achieve adequate control. We can guide you on the correct selection and use of RPE as part of a comprehensive exposure control strategy.

W201/M200 - Basic Principles in Occupational Hygiene

Broader understanding of occupational hygiene principles helps us consider your LEV system within the context of your overall workplace health and safety strategy, including workplace exposure limits (WELs) and COSHH assessments.

What This Means for You

We don't just test your system - we understand why it's failing and how to fix it.

This comprehensive qualification set means when we conduct your LEV test, you receive:

• Expert diagnosis - identifying root causes, not just symptoms
• Design insight - recognizing when poor performance is a design issue
• Advanced analysis - going beyond basic pass/fail testing
• Practical solutions - actionable recommendations based on deep technical knowledge
• Comprehensive advice - including RPE where needed and COSHH compliance

Over 20 Years Experience

Combined Air Limited has been providing specialist LEV services since the early 2000s. We combine formal BOHS qualifications with decades of practical experience across welding, woodworking, metalworking, and general industrial extraction applications.

Our client base includes major manufacturers, engineering companies, fabrication shops, and woodworking operations across the UK - all trusting us to keep their workforce safe and their operations compliant.