LEV Central

The Knowledge Base for LEV

Washington State Dept. of Labor & Industries; Industrial Ventilation Guideline

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Introduction  Industrial ventilation is a method of controlling worker exposure to airborne toxic chemicals or flammable vapors by exhausting contaminated air away from the work area and replacing it with clean air. It is one alternative to control employee exposure to air contaminants in the workplace. Other alternatives include process changes, work practice changes, substitution…

Minor modifications: ITT – smoke test

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This is a case study on the HSE website which looks into how minor modifications to an LEV Hood can make significant improvement to a tracer smoke assessment. ITT used booths to control exposure to harmful gases, mists and vapours emitted during cleaning of metal components. When smoke tests were used to check the effectiveness…

Local Exhaust Ventilation for the Control of Welding Fumes in the Construction Industry—A Literature Review

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Abstract Arc welding is a common unit operation in the construction industry, where frequent changes in location and welding position make it more difficult to control fume exposures than in industries where fixed locations are the norm. Welders may be exposed to a variety of toxic airborne contaminants including manganese (Mn) and hexavalent chromium (CrVI)….

Process Guidance Note 6/02(12)

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Process Guidance Note 6/02(12) Statutory guidance for the working of timber and manufacture of wood-based products.  September 2012. This is a document sourced in reply to a forum topic about Cyclones and Wood dust.  This explains the moisture content of typical wood dusts and when to apply and specify cyclones.

February 2016 Newsletter

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Here is February 2016 Newsletter. On the LEVel is designed to give you a snapshot of the activity on LEV Central as well as news about the industry. If you have a story you would like to feature in future issues of On the LEVel then please email and/or LEV Central newsletter February 2016


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Radigan Engineering have a free to download excel spreadsheet. Taken from their website: When in the course of human events it becomes necessary to calculate the Darcy-Weisbach friction factor… engineer’s often throw up their hands, go back to their old college textbooks, and say “about .02!” [Which normally isn’t off by more than a factor…

Slideshare LEV Presentation

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This is a Power Point presentation hosted on Slideshare.  UKNSG Conference 3% Working Safely with Nanomaterials RSC London, 9 September 2015 H55 Controls: Devising Control Methodologies and New Approaches John Saunders Principal Scientist Science Directorate, Health and Safety Laboratory Follow the link to slideshare to access the presentation.