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LEV System Design

The most important part of any LEV system is the design. Quite simply, if the design isn’t right, the system will not work effectively. Years of extraction system design and experience make us perfectly placed to design or improve your LEV system.

The contaminant

Local Exhaust Ventilation system requirements vary depending on the contaminant. Once the contaminant has been determined, our LEV engineer will establish the most effective and efficient system/products required to remove it from the working environment.

Design elements

Our team of design engineers are trained to BOHS P602 – Basic design principles of local exhaust ventilation systems (proficiency module specified by the British Occupational Hygiene Society) to ensure that the system design is not only effective, but meets the requirements of industry standards. When designing a system we will consider the following factors, as specified by the HSE (Health & Safety Executive):

  • Hood/Enclosure – to collect and contain the contaminant as close as possible to its source
  • Ducts to remove the contaminant away from the source and either discharge to atmosphere or return cleaned air to the workroom
  • A filter or other air cleaning device, normally placed between the hood and the fan
  • A fan or other air mover to provide the airflow

Installation and commissioning

We will install your new LEV system with minimum disruption to your manufacturing processes. Once your LEV system has been installed we will provide you with the following (as specified by the HSE):

  • Instructions for use and system diagram
  • Logbook to keep track of testing and maintenance
  • Commissioning report showing inlet air flow measurements, duct air speed, filter pressure drop and a maintenance guide
  • Airflow indicator (optional)
  • Parts and spares list i.e. filter bag replacements (available from Impact Technical Services)

Using your new system

Your LEV system is now up and running. There are a few things you need to remember to ensure reliable operation:

  • Always follow instructions provided
  • Regularly look for signs of damage to the ducting, fan and filter. Any damage must be repaired immediately to ensure efficient operation
  • Check weekly that the system is working properly and airflow indicators (if installed) are working
  • Review failure patterns for ease of maintenance
  • Contact us to book thorough examination and testing at least once every 14 months (as specified by the HSE)

Further information

The HSE (Health & Safety Executive) has produced the following publications to provide you with further information on what to look out for from your LEV system provider, as well as the reasons why you should have LEV in your workplace.

Clearing the air

A simple guide to buying and using local exhaust ventilation (LEV)

Design points for new LEV systems

Time to clear the air – A workers pocket guide to LEV

Controlling airborne contaminants at work – A guide to LEV

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