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.