COSHH Local Exhaust Ventilation LEV Initial Appraisal

An initial appraisal is required with a new local exhaust, (industrial) ventilation system installation. It may also be required if an existing system has been substantially modified, ie branches added / removed, capture hoods/booths modified, substances or process changed, filtration / abatement system modified, alteration in air supply systems etc.

An initial appraisal sets outs the correct operating parameters of the system, together with all the relevant ‘bench-mark’ test data for future ‘thorough examination and testing’ (usually 14 monthly.)

R&B Industrial can demonstrate whether an LEV system provides adequate control of personal exposure by carrying out a LEV Initial Appraisal.

Our Initial appraisals will:

  • Show that the system works and meets specified performance criteria, to control exposure;
  • Determine the operating criteria
  • Review the hazardous substances including synergy effects, and offer advice about improving working practices to reduce exposure
  • Provide overview and advice for DSEAR (Dangerous Substances and Explosive Atmosphere Regulations) compliance if and where applicable
  • Including comprehensive report, and LEV log book, including
  • List of hazardous substances and WELs
    • Details of LEV system operation, alarms, stack design
    • Details of abatement / filtration system including operating parameters where applicable
    • Clear diagrams with test points identified
  • Confirmation of control by air sampling for personal exposure. This can include a wide variety of hazardous substances ie dusts, fumes, gases and vapours, (additional costs may apply). see Air Quality and Personal Air Sampling and Monitoring
  • Carry out minor remedial works if competent, safe and covered by risk assessments
  • Include advice on design of continuous on-line monitoring systems, if applicable ie for return air systems back to workplace. See Stack LEV Continuous Monitoring Systems

We will also refer to other guidance and documentation such as:

  • EN 14175 - Laboratory Fume Cupboards
  • DfEE Fume Cupboards in Schools, Bulletin 88
  • BS 4163 - Health and safety for design and technology in schools and similar establishments. Code of practice

We provide detailed reports meeting the above codes of practice and guidelines, including:

  • Substitution of hazardous substances and synergy effects
  • Investigation of working practices and substances being used
  • Design improvements / recommendations
  • System diagrams
  • Stack / discharge effectiveness and environmental impact
  • Full test results stating inadequacies / capture velocities etc. as required..
  • We will carry out simple remedial works where safe and competent to do so (generally within price of initial appraisal or re-test), such as
  • correcting fan direction
  • adjusting air flow dampers
  • checking for blockages in filters / duct-work systems

Our services also cover ATEX fume and dust extraction systems with additional testing including items such as, but not limited to:

  • Checking for appropriate type of filter media such as conductive / antistatic etc
  • Filter media conductivity tests
  • Ducting and equipment earth bonding checks to CLC-TR_504042003, Electrostatics - Code of practice for the avoidance of hazards due to static electricity
  • Checking air flows with respect to hazardous area classification; ensuring zoning classification is maintained
  • Checking air flow alarm system operation and calibration as required
  • Checking fan and electrical equipment for correct zoning, category and equipment protection.
  • Checking for potential ignition sources

In addition we can also comment on Noise @ work and ATEX / DSEAR issues and regulations etc. see Dangerous Substances and Explosive Atmosphere Regulations.