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Durham University

Health and Safety Service

Local Exhaust Ventilation

Local Extract Ventilation (LEV) is the name given to equipment used to protect an operator from hazardous substances including dusts, chemicals or micro-organisms.

Contaminants which require exposure control include dust (e.g. stone dust), mist (e.g. paint mist from spraying), fume (e.g. from welding), gas (e.g. laboratory gases) or vapour (e.g. solvents).

There are many different forms of LEV in our Universities workshops and laboratories and it is important to ensure they are correctly specified, used, checked and maintained.

The HSE guidance document HSG258 Controlling airborne contaminants at work - a guide to local exhaust ventilation (LEV) is a useful source of information for those responsible for selecting, checking and managing LEV within departments and services.

LEV logbooks

Each LEV system should be accompanied by a log-book, which details and records substances used with the system, pre-use/daily user checks and periodic testing requirements. A number of different templates are available for departmental use:

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