Workplace dust and fume extraction solutions

Airflow Indicators for LEV Systems

Air flow indicators are designed to be used in LEV systems to ensure that the air flow rate in the system is maintained so employees are protected at all times.

Air flow Indicator Benefits:

  • Easy visual readings (red = airflow to be checked, green = adequate airflow)

  • Limits operational downtime and staff absenteeism

  • Assists in ensuring adherence to COSHH regulations

  • Low price and easy installation

  • Flow rates are maintained resulting in protection of employees

LEV systems are installed to protect workers from exposure to hazardous substances. They should be tested at least once every 14 months by competent people in accordance with Regulation 9 of COSHH 2002 Regulations. To prevent possible exposure between the regular tests, it is imperative that the operator has an indication that the LEV system is working within control parameters. The simplest form of indication is to fit airflow indicators at each extraction point, which is recommended in HSG258, the latest guidance on LEV from the HSE (Health & Safety Executive).


Impact Technical Services will survey your system to determine control parameters and then supply and fit suitable indicators showing safe and unsafe ranges directly to the operator, so that rectification of the problem can be made. The gauge displays the vacuum level at the duct or hood to quickly and easily identify the airflow velocity through that specific point of extraction. If it falls into the red zone, the airflow will not be extracting the hazardous substances.


As emphasised in the recent COSHH update (November 2013), it is the employers responsibility to ensure that LEV systems are working properly, to which end an airflow indicator is the ideal solution.


Find out more here:

HSE HSG258 Controlling airborne contaminants at work

COSHH 2002 Regulation 9: Maintenance