This page provides practical advice for employers and employees on buying and using local exhaust ventilation (LEV) and what to do to comply with the law. It will help designers, installers and examiners work with their customers to control airborne contaminants effectively. Frequently asked questions, case studies, a glossary of terms, calculator tools, useful links, and videos on common processes and sources are available. The following publications can be downloaded: Clearing the air: A simple guide to buying and using LEV and Time to clear the air!: A workers' pocket guide to LEV.