(LEV) Local Exhaust Ventilation Testing systems are designed to protect your workers from fumes as well as from hazardous dust. Local Exhaust Ventilation (LEV) is the term used to describe a system of ducting used to extract dust and fumes from workplaces to protect workers.

Need for regular Local Exhaust Ventilation testing

LEV systems can lose their effectiveness over time due to many factors including drive belts for fans slipping, build-up of dust inside ducts, leaks in the ducting etc.  Local Exhaust Ventilation systems should therefore be inspected regularly.

In Ireland and in the UK the maximum interval for LEV inspection is 14 months; HSE document HSG258 specifies the procedure.  In Ireland, the HSA refers to the UK HSE document.


Local Exhaust Ventilation Testing methods

LEV Testing Inspection carried out by Environmental Efficiency are to The Control of Substances Hazardous to Health Regulations in Ireland or the applicable legislation elsewhere.

Our experts measure the velocity in the ducts and compare to the recommended velocity.  The effectiveness of hoods will be assessed using a smoke test and measurement of air velocities.  A comprehensive LEV Testing report is then issued with diagrams of the ducting and photographs to clarify the report.



Environmental Efficiency has the capability and necessary equipment to inspect such LEV Testing systems (Local Exhaust Ventilation).  Sites inspected to date include sawmills, foundries, welding and fabrication shops as well as solvent users.