Local Exhaust Ventilation (LEV)

Local Exhaust Ventilation (LEV) Systems are required by law to have a statutory inspection completed every 14 months.  The inspections must be conducted by a person who is deemed competent to do so and to comply with this it is normal practice for such persons to hold a British Occupational Hygiene Society (BOHS) P601 qualification in Statutory Inspection of LEV Systems.

LEV Statutory Inspection

When we conduct an inspection of your system we complete the following steps to ensure compliance:

Step 1: A thorough visual examination

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

  • Condition of captor hoods duct-work
  • 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 exposure
  • Smoke testing to visualise air movement and contaminant capture
  • Dust lamp tests, where appropriate
  • Observations of the Operators interaction with the LEV system


A detailed examination and test report will follow an 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 including any recommendations for remedial requirements detailed in a prioritised action plan.  

Please contact us to discuss how we can help with your LEV requirements.