LEV (Local Exhaust Ventilation) Testing

Professional LEV testing at hard to beat prices

Welder fume extraction

Local Exhaust Ventilation (LEV) systems require testing every 14 months under the current Control of Substances Hazardous to Health Regulations (COSHH). Every employer who provides any LEV to meet the regulations shall ensure: “it is maintained in an efficient state, in efficient working order, in good repair and in a clean condition” – Regulation 9 -1 COSHH

We are able to assist our clients to meet their needs, no matter how small or large, by providing a total solution, including a wide range of equipment and services to assist with effective compliance.

  • Avoid unlimited fines
  • Reduce environmental footprint
  • Avoid health complaints from employees.
  • Minimize Insurance premiums

MBHS provides a comprehensive LEV Testing service to ensure your company is meeting the requirements laid out by Regulation 9 of COSHH and the guidance notice HSG54 “Controlling airborne contaminants at work: A guide to local exhaust ventilation”.

  • Fixed extraction systems or mobile units
  • Fume, Dust and General extraction of all types
  • New Installations
  • Servicing, spares and repairs for above
  • All engineers are qualified to BOHS (British Occupational Hygiene Society) P601 qualification
  • Nationwide coverage

LEV Tests on site

Physical inspection of the system inclusive of a line drawing.
Provide a comprehensive report giving performance rates of each system.
Calculation of Smoke Clearance times for Spray Booths using smoke machines ( additional cost ).
Issue a Certificate of Compliance with COSHH requirements, should the systems pass HSE regulations
We can also carry out assessments of new ventilation systems for compliance with Building Regulations Approved Doc F

Competitive prices for LEV Testing

Please contact us for a personalised quote.

Prices are dependant on type, quantities and location of LEV systems.

Example (Dependant on location)

  • 1 x LEV system ( up to 10 extraction points ) £ 190 + vat

We now supply and fit Air Flow Indicators

The HSE’s LEV guidance HSG 258 recommends that airflow indicators (such as manometers) are fitted to the hoods of the LEV system.

As an employer you do by law have to make sure your LEV system keeps working properly. One of the main reasons why LEV doesn't do what it should is because the airflow falls for some reason (due to a build-up of material, damage to ducting etc), becomes inadequate and if effective control is lost.

The airflow indicator will provide you with the reassurance that the flow-rate is maintained, that the protection for employees is there and that you’re not wasting money.

The type of airflow indicator to be fitted

This will depend on the level of potential health risks. If risk is low, a standard manometer will be appropriate. More hazardous substances and high risk situations may require more sophisticated, and potentially more costly, indicators e.g. with an alarm if airflow drops too low.

Whatever indicator is chosen, it will need to show clearly whether the airflow is adequate.

Proposed Methodology and Reporting for LEV/COSHH Testing

The assessments relating to your local exhaust ventilation( LEV) systems will fulfil the requirements of:

  • The Control of Substances Hazardous to Health (COSHH) Regulations, 2002 (as amended).
  • HSE Guidance Note HS(G) 258: Controlling airborne contaminants at work – A guide to local exhaust ventilation(LEV)

The thorough examination and testing of the LEV systems will involve the following 3 steps:

Step 1: A thorough visual examination

The thorough examination (where access permits) will include the inspection of the following:

  • Condition of captor hoods ductwork
  • Fans / air movers
  • Filter / air cleaning equipment including monitors and alarms.

Step 2: Measurement of technical performance

The measurement of technical performance will include the following:

  • Static pressure
  • Duct transport velocity
  • Temperature
  • Face and/or capture velocities
  • Pressure drop across fans / filters

These measurements will be undertaken, where appropriate, using calibrated equipment including various anemometers, manometers, pilot static tubes, etc.

Step 3: Assessment of the LEV systems control effectiveness

The assessment of control effectiveness will include the following:

  • Visual observations of processes and contaminant sources
  • Effectiveness of LEV at controlling operators exposure
  • Smoke testing to visualise air movement and contaminant capture
  • Dust lamp tests, where appropriate
  • Observations of operators interaction with the LEV system


A detailed examination and test report will follow a HSE approved format and will include measurement test data, schematic diagrams of the LEV systems, and an assessment on the control effectiveness of the system and any recommendations for remedial requirements detailed in a prioritised action plan. It is envisaged that the report will be issued within twenty working days of completion of site work.