P604 – Performance Evaluation of Local Exhaust Ventilation Systems
BOHS Level 4 Qualification
P604 is an advanced technical course programme focused on the Commissioning and the critical evaluation of Local Exhaust Ventilation (LEV) system performance.
This qualification develops the analytical skills required to assess whether an LEV system is functioning effectively in controlling hazardous substances and achieving its intended design objectives.
Who Should Attend
This course is suitable for:
- Experienced LEV practitioners undertaking system evaluation
- NOTE: It is a BOHS prerequisite that candidates hold P601 qualification before attending P604
- Professionals who have completed P601 and/or P602
- Engineers responsible for reviewing system effectiveness
- Those seeking a deeper understanding of performance diagnostics and optimisation
Course Overview
The programme provides structured coverage of:
- The principles of performance evaluation and verification
- Assessment of airflow, capture efficiency and contaminant control
- Interpretation of quantitative measurement data
- Comparison of actual system performance against design specifications
- Identification of system deficiencies and corrective strategies
- Commissioning LEV systems
P604 forms a key component of the BOHS Level 4 Certificate in Local Exhaust Ventilation and represents a higher-level integration of testing, design and control principles.
What You Will Learn
By the end of the course, delegates will understand:
- How to critically assess whether an LEV system is delivering effective control
- How to interpret airflow measurements within operational context
- How hood design, duct configuration and fan performance influence real-world outcomes
- How to evaluate an LEV system to balance or rebalance ensuring duct transport velocity effectiveness
- How to diagnose performance shortcomings and recommend improvements
- The importance of integrating measurement data with workplace exposure considerations
Applied Performance Analysis
The course develops analytical thinking through structured technical exercises and scenario-based evaluation tasks.
Delegates must p[ossess P601 certificate and are expected to have prior knowledge of LEV testing and design principles before attending.
Important Note on Competency
P604 strengthens technical understanding of LEV performance evaluation.
Competence to make professional judgements in live workplace environments requires appropriate practical experience in addition to qualification.
Assessment
The qualification assessment consists of a BOHS-set written examination designed to test applied understanding and analytical reasoning.
- Structured technical and scenario-based questions
- Interpretation of performance data
- Applied evaluation of system effectiveness
Following the exam candidates are required to submit a Commissioning or Re-commissioning Report that they have undertaken – to BOHS
Successful candidates are then awarded the BOHS P604 Certificate.
Delivery Formats
- Live interactive webinar (Zoom)
- Face-to-face training (typically Hilton East Midlands, J24 M1)
- Available for in-house delivery by arrangement
Fees
£1695 + VAT
BOHS examination fee: £270 + VAT (reviewed annually by BOHS)
Invoices are issued approximately 5–6 weeks prior to the course start date.
Progression
P604 completes the BOHS P601–P604 Level 4 pathway in Local Exhaust Ventilation.
Successful completion contributes toward the BOHS Level 4 Certificate in LEV and supports progression toward higher professional recognition within the industry.
Professional Recognition
The P604 qualification is widely recognised within the LEV sector as a benchmark indicator of advanced technical understanding in system performance evaluation and control effectiveness.
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