How do we know if our LEV system is adequately controlling exposure?

You know an LEV system is adequately controlling exposure when it consistently captures contaminants at source and keeps airborne levels low in the breathing zone. Formal examination and testing results are the starting point, but day-to-day performance matters just as much.

Test reports should show that airflow rates and hood performance meet the system’s design intent. Smoke testing often helps demonstrate whether contaminants are being drawn away effectively. If workers aren’t experiencing irritation, strong odours, or visible dust escape, that’s another positive sign.

Exposure monitoring, where appropriate, can provide further reassurance. If measured exposure levels are well below relevant limits and remain stable over time, the LEV is likely doing its job.

Adequate control isn’t a one-off achievement. Systems need regular checks, maintenance, and user awareness to remain effective.