£1,075.00 +VAT

SKU: P602 Category:


Basic Design Principles of LEV Systems

P602 Course overview

This competence-based LEV training course follows the BOHS P602 LEV Basic Design Principles syllabus.

The course is designed to provide the methodology and the theoretical and practical knowledge to enable delegates to design basic LEV systems which will control hazards.

It equips delegates with the basic skills to be able to specify LEV systems, including calculating an appropriate Benchmark for correct hood selection, using Fletcher’s Nomogram/Equations for captor hood design, calculating system pressure losses and specifying an appropriate fan.

The course also covers the essential requirements for LEV Commissioning, Examination and Testing and the preparation of suitable records (including LEV Manuals and Log Books).

Learning objectives

After completion of the P602 training course delegates should be able to:

  • Select the correct Hood required using Benchmarking techniques
  • Design basic Partial Enclosures, Captor Hoods, Receptor Hoods etc
  • Undertake a full Design exercise for a basic LEV systems
  • Undertake Commissioning tests to determine if the system is effective and operating to design specification
  • Prepare suitable records of the basis of design.


It is assumed that delegates attending the P602 LEV course will have had day-to-day dealings with Local Exhaust Ventilating plant.

Delegates must be competent in basic maths/algebra (areas of circles, square roots, etc.)

No other specialist knowledge is required.

Who should attend?

Engineers, supervisors, managers, health and safety professional and technical staff who have day to day dealings with the specification, design, testing, contract management, and occupational hygiene aspects of LEV plant.

Towards professional recognition and qualification?

The P602 qualification can be added to other BOHS modules e.g. P601, P603, P604 and W201 (in various combinations) to gain further professional recognition through BOHS, e.g. Certificate of Operational Competence in Control – which permits the successful candidates to use the post-nominal letters ‘CoC Control’ after their name.

In combination with the remaining P600 series of LEV training courses (and W201) candidates may also be eligible for membership of BOHS as Licentiate of the Faculty of Occupational Hygiene (LFOH). See BOHS for more details.

Successful qualification in P602 LEV Design also meet various membership levels for the Society of Operations Engineers (SOE) and the Institute of LEV Engineers (ILEVE).



P602 Course programme

Day 1 – Workplace Control Principles

  • Sources of exposure
  • Hierarchy of control options
  • Practical application of control measures
  • Testing for adequacy/performance evaluation
  • CoSHH risk assessment implications
  • Types of systems in use
  • Hood design
  • Duct design (sizing/configuration/design)
  • Fans (types/specification/applications/design limitations).

Day 2 – Design of LEV Systems (1)

  • Filtration (specifying/performance characteristics/limitations)
  • Balancing systems
  • Flammable materials
  • Discharge arrangements
  • Make-up air/replacement air
  • Recirculation systems
  • Behaviour of hot plumes
  • Use of instruments and flow visualisation techniques
  • Fault diagnosis.

Day 3 – Design of LEV Systems (2)

  • Calculation of pressure losses
  • Fan selection
  • Design Exercise 1 – simple two branch system
  • Design Exercise 2 – design of more complex multi-branch system
  • Course review.

Day 4 – Examination/Assessment

  • Review and revision
  • Short form answer examination.


£1075 (+exam fee £165) + VAT / delegate

Follow on course

The P604 Performance Evaluation and Management of LEV Systems LEV course follows on from this P602 course.


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