P602 – Basic Design Principles of Local Exhaust Ventilation Systems
BOHS Level 4 Qualification
P602 is a technical course focused on the fundamental design principles of Local Exhaust Ventilation (LEV) systems.
This qualification develops the knowledge required to understand the principles of design for effective LEV that will achieve adequate control of hazardous substances in the workplace, in accordance with CoSHH requirements.
Who Should Attend
This course is suitable for:
- LEV designers and engineers responsible for system specification
- Professionals progressing through the BOHS Level 4 LEV qualification pathway
- Those involved in commissioning or modifying LEV systems
- Practitioners seeking a deeper understanding of airflow engineering principles
- LEV Examiners and Testers who wish to undertake TExT on “Complex” LEV systems
Course Overview
The programme provides structured coverage of:
- The principles of effective contaminant control
- Hood design and positioning
- Ductwork design and air velocity considerations
- Fan selection and system resistance
- Air cleaning devices and discharge arrangements
P602 forms a core component of the BOHS Level 4 Certificate pathway in Local Exhaust Ventilation.
What You Will Learn
By the end of the course, delegates will understand:
- The scientific principles underpinning effective LEV design
- How to calculate airflow requirements for contaminant control
- How duct sizing affects velocity, pressure and transport efficiency
- The relationship between static pressure, velocity pressure and total pressure
- Fan performance characteristics and system matching
- How to avoid common design faults that compromise system effectiveness
Applied Design Calculations
The course includes structured calculation exercises to develop confidence in applying airflow equations, pressure loss estimation and system balancing principles.
Delegates should be comfortable with basic mathematics and engineering concepts before attending.
Important Note on Competency
P602 develops technical knowledge of LEV system design principles.
Competence to design and specify LEV systems in practice requires appropriate workplace experience in addition to formal qualification.
Assessment
The qualification assessment consists of a BOHS-set written examination designed to evaluate applied understanding of LEV design principles.
- Calculation-based technical questions
- Applied design problem-solving
- Interpretation of airflow and pressure data
- Following successful completion of the exams, delegates are then required to complete 2 LEV Design appreciation Case Studies which are set and marked by BOHS
Successful candidates are awarded the BOHS P602 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
£1595 + VAT
BOHS examination fee: £270 + VAT (reviewed annually by BOHS)
Invoices are issued approximately 5–6 weeks prior to the course start date.
Progression
P602 forms part of the BOHS Level 4 LEV qualification framework.
Delegates typically progress to:
P603 – Control of Hazardous Substances
P604 – Performance Evaluation of LEV Systems
Professional Recognition
The P602 qualification supports progression toward professional membership of BOHS and the Society of Operations Engineers (SOE) and is widely recognised within the LEV industry as a benchmark qualification for LEV design and LEV TExT practitioners.
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