P602 Basic Design Principles of LEV Systems


The P602 LEV Design course is offered in both Webinar and Face-to-Face formats.  For some dates parallel courses are being run in both formats.

Webinars are conducted ‘live’ using the Zoom platform while face-to-face courses are normally held at the Hilton Hotel. Leicester.

When booking do make sure that you select the most suitable option for your delegates.

Payment is not required at checkout.  Invoices will be sent approx 5-6 weeks before the course.

P602 is a comprehensive 4-day training programme which covers the theoretical aspects and applied engineering knowledge for delegates to be able to design basic Local Exhaust Ventilation (LEV) systems.

OXYL8 Training Room Set-upOn P602 delegates learn how to accurately specify and design LEV systems.  This will include performing Benchmarking calculations to select the correct style of control to be specified.  It will also cover using Fletcher’s Equations appropriately and the calculations required to determine system pressure loss and flowrate requirements for basic LEV control systems.

The course follows closely the guidance outlined in HSE’s HSG258 (a copy of which will be provided as part of the


Upon completion of the P602 LEV Design course delegates will be able to:

  • Select the correct Hood required using Benchmarking techniques
  • Design basic Partial Enclosures and Receptor Hoods etc
  • Use Fletchers Equations (using the free OXYL8 App) to design and specify Captor Hoods
  • Conduct a full Design exercise for a basic LEV system
  • Perform Commissioning tests to assess how effective a system is and if it is operating to design specification
  • Prepare suitable records based on the design.


It is desirable for candidates to have:-

  • Successfully completed P601 “Thorough Examination & Testing of LEV Plant”, or  to be able to demonstrate an equivalent level of learning
  • A good understanding of HSE’s Guide HSG258 “Controlling Airborne Contaminants at Work
  • Proficiency in basic maths including algebraic calculations such as areas of circles and square roots, etc.

No other specialist knowledge is required.


P602 LEV Design course is ideally suited to engineers, supervisors, managers, health and safety professional and all technical staff who may be involved in the specification, design, testing, contract management, and occupational hygiene aspects of LEV plant.


The P602 LEV proficiency qualification can be combined with other BOHS modules e.g. P601, P603, P604 and M200 to progress to further professional recognition through BOHS.

Succesful candidates may add these qualifications to progress to the award of the Certificate of Operational Competence in Control.  This carries the priviledge of being able to use the post-nominal letters ‘CoC Control’ after their name.

Professional Standards Authority Accredited Register LogoThe award of CoC(Control) together with gaining the M200 qualification may then allow the delegate to be awarded LFOH(S) – Licentiate of the Faculty of Occupational Hygiene and also permit entry into the Professional Standards Register for “Occupational Hygienists and other Specialists”.  See BOHS and our OXYL8 CoC/PSR Newsletter for further details.


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, including the use of Fletchers Equations for Captor 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 Case Studies
  • Course review.

Day 4 – Examination/Assessment

  • Review and revision
  • Short form answer examination (Webinar course exam taken online)


£1400 (+exam fee £200*) + VAT / delegate

* Exam Fees reviewed by BOHS Jan each year


Following on from the P602 course you may wish to consider the P604 Performance Evaluation and Management of LEV Systems course or the P603 CoSHH PPE Course as your next step?


OXYL8 LEV Course MaterialsWe work very hard with all our students to ensure they gain significant knowledge from the course …  and secure a pass ….. first time.  Our Delegates will also receive comprehensive course support materials, handouts, pre-course guides etc.

Our pass rates are excellent!

Following on from the course additional Mentoring support is available from our Tutors on a one-to-one basis via Zoom.  Delegates can choose and book a date and time  online which is convenient to both themselves and the Tutor.


Bill Cassells

Bill Cassells


Hazel Griffiths

Hazel Griffiths

BSc CoC(Control) LFOH

Dan Colledge

Dan Colledge

CoC(Control) LFOH(S)

Louise Wood

Louise Wood


   LinkedIn Profiles
Bill      – Bill Cassells
Hazel – Hazel Griffiths
Dan    – Dan Colledge
Louise – Louise Wood

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