LEV Central

The Knowledge Base for LEV

OXYL8 delivers BOHS-approved courses in the fields of Local Exhaust Ventilation (LEV) and basic Occupational Hygiene.

Our LEV and Occupational Hygiene training courses, designed and moderated by BOHS, are accepted by the Health and Safety Executive (HSE) as key elements in securing basic competence in various aspects of LEV, be it design, specification, commissioning, management or examining and testing.

Do visit our main training website – now with even more information, downloads, links and training materials. To view – click here:

Details and dates/venues for our upcoming courses can be found by following these links:-


P600  Methods for Testing Performance of LEV – P600 Details and Dates

P601  Examination & Testing of LEV – P601 Details and Dates

P602  Basic LEV Design – P602 Details and Dates

P603  CoSHH PPE – P603 Details and Dates

P604  Performance Evaluation & Management of LEV – P604 Details and Dates

W201  Introduction to Principles of Occupational Hygiene – W201 Details and Dates


To visit our LEV Training Course website:-

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Here at Airducts we understand that the world of LEV can be a little daunting.  We offer bespoke structured programs to educate, guide and help you progress through your career path.

We are competent LEV Engineers and have experience of the design and appraisal of all types of systems.  Over the years we have built an extensive catalogue of photos and resources and can offer a realistic insight to the LEV profession from an engineers perspective.  We also have experience of the BOHS P-Cert courses having sat P601, P602, P603 & P604.

Some of the services we provide include:

  • Mentoring.
  • Professional development.
  • Pre and post P601, P602 & P604 Training (Both class and field based).

The benefits to be had are:

  • Improved confidence.
  • Knowledge and skills.
  • Valuable advice.
  • Enhanced motivation.

We currently offer our services across the UK and Ireland and can provide references from successful mentoring & courses upon request.

Please email for further information.

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DevineAir Limited has 15 personal years of hands on LEV testing, over 10 of which were embedded with a large challenging Aerospace Manufacturing client.  We have experience with a wide range of LEV systems and we are ideally set-up to deliver hands on experience, tailored to individual needs, to those new LEV assessors requiring that extra assurance after their P601, 2 or 4 to fulfil their roles with confidence.

DevineAir Limited is a multi-disciplined Environmental Consultancy. Our other services include:

  1. Cleanroom & Healthcare Verification
  2. Occupational Air Monitoring
  3. Breathing Air Testing
  4. Indoor Air Quality Audits
  5. Noise Assessment
  6. Asbestos Surveying
  7. Legionella Risk Assessment

We are an Irish company who could benefit you by offering Mentoring which avoids working with any direct competition. We would invite to visit our website,, for a more comprehensive overview of our services.

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SOE works to advance Operations Engineering for the benefit of everyone through education, training, study and research. SOE also establishes and maintains standards of competence and conduct for those engaged in Operations Engineering professionally, with an emphasis on enhancing public safety. Through its Professional Sectors of IRTE, IPlantE and BES, SOE directly influences the road transport, plant and engineer surveying sectors, developing best practice and improving compliance across the board.

For LEV specialists – the SOE has a sub-branch – the Institute of Plant Engineers (IPlantE).

Members can join as Associates of SOE/IPlantE on-line – Join SOE

Other grades available are Member and Fellow.

Through the SOE members can be put forward to the Engineering Council for the awards of Eng Tech, IEng and CEng appropriate to their qualifications and expertise/experience.

This PowerPoint presentation provides more information on SOE and the possibilities from membership SOE Membership

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BOHS is one of the biggest occupational hygiene societies in Europe, and the only professional society representing qualified occupational hygienists in the UK. The Society as a whole offers membership to anyone with an interest in a healthy work environment. If you’re not yet a member why not consider joining? Check out the benefits and join online via the Membership section.

The Faculty of Occupational Hygiene within BOHS develops and maintains the professional standards of occupational hygienists, and membership of the BOHS Faculty is restricted to professionally qualified hygienists. The Faculty is also the only UK examining board for professional, postgraduate qualifications in occupational hygiene. The Education section is full of information about routes into occupational hygiene, or if you want specific details about qualifications, go straight to theExaminations section.

Proficiency Modules

P601/P602 LEV qualifications flyers

The most recent Local Exhaust Ventilation (LEV) guidance from the HSE, HSG258, refers to both of our LEV qualifications – ‘P601 Initial Appraisal and Thorough Examination and Testing of Local Exhaust Systems’ and ‘P602 Basic Design Principles of Local Exhaust Ventilation Systems’.

P601 is useful for any technician who actually tests ventilation systems within industry and in public sector buildings, and P602 is about basic design, and is therefore relevant for company engineers and managers who design their own systems. The syllabus for each course can be downloaded here:

P601 LEV Examination & Testing

P602 LEV Basic Design

Gaining proficiency Certificates – P601, P602 etc leads to the possibility of gaining further recognition within BOHS via the “Specialist” routes within the Faculty.  This leaflet outlines the route-map towards gaining, in the first instance the award of “Certificate of Operational Competence (Control)”  Specialist Routes to Progress in the Faculty of Occupational Hygiene

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ILEVE has been established to promote air quality in the workplace and to reduce ill health and death due to airborne contamination and hazardous substances in the working environment.

The Institute exists to recognise competence in the practical application of local exhaust ventilation and to raise awareness of the importance of good air quality and ventilation in workplaces.  ILEVE is supported by the Health and Safety Executive.

The Mission is to provide safely controlled working environments, free from harmful airborne contaminants by:

  • Providing its members and the public with first class information
  • Providing a career path for Engineers in Local Exhaust Ventilation to full professional Registration.
  • Maintaining and Enhancing professional excellence throughout by developing and accrediting courses of study
  • Providing a membership designation FILEVE, MILEVE, AILEVE etc. as a credential giving others evidence of demonstrated knowledge and skills
  • Setting the criteria for best practice in the profession
  • Speaking for and representing  the profession

The Institute of Local Exhaust Ventilation Engineers (ILEVE) is being developed under the umbrella of CIBSE (The Chartered Institution of Building Service Engineers) and  aims to provide a higher profile and focus for Local Exhaust Ventilation Engineers.

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