LEV Central

The Knowledge Base for LEV

HSE Guide P40: Wide-Format Printing with UV-Curable Inks (Ozone)

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This HSE Guidance Leaflet, which was published in 2005 describes good practice for digital (ink-jet) printing on machines up to 3.2 metres wide, using UV-curable inks. It advises the use LEV (extraction) for any Ozone produced by the process.

HSE Guide P7: Printing with UV Curable Inks and Coatings

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HSE Guide for Printing Industry, published in 2005 describes good practice for printing with UV-curable inks where the ink-curing lamps generate ozone. It discusses the use of LEV for controlling any ozone produced in the process.


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Second Edition, Published by HSE 2011 This is HSE’s current guide on LEV and related topics.  Here you will find recommended Duct Velocities, Captor Velocities, Face Velocities, and other design criteria. The various types of hoods, filters, fans and discharges are all described. Sections on Manuals and Log Books, LEV Examination and Testing protocols and…

On-Torch Welding Fume Extraction – Video Clips

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I’m a convert! Often over the years since leaving HSE I have seen on-tool extraction systems for welding which simply did not live up to their promises. More recently – a new generation of MIG welding torch extraction units have come onto the market from a number of suppliers.  The video clips and links below…

BS EN 12021:2014 Respiratory Equipment – Compressed Gases for Breathing Equipment

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This British Standard will be very useful to anyone undertaking quality/safety testing of compressed air used to supply – Respiratory protective devices – compressed air line breathing apparatus. Purchase a copy of the Standard here:- BS EN 12021: 2014

HSE Video of Smoke Clearance Testing – Smoke Dispersal in Spray Room

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Short video produced by HSE showing (in fast play mode) the dispersal of smoke in an average Spray Room during clearance testing. Video can be viewed here: HSE Smoke Clearance Video Smoke generators may be purchased here:

Paint Booth Clearance Times – Smoke Testing HSE

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This HSE Research Report from 2006 reviews commercially available (party) smoke machines which could be used for determining the clearance times of paint spray booths. ” ……….. Seven different fog machines were tested for assessing the clearance times of spray booths and rooms, the results were compared to the Colt 4 smoke generator currently used by…

Wake Effect – Partial Enclosures

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The Wake Effect is well known and indeed it is covered at some length in HSE’s Guidance Note HSG258 (Controlling Airborne Contaminants in the Workplace. Have just come across this published research paper from 1994 which considers the Wake Effect in detail Abstract—Wake Effect – Boundary layer separation leads to the formation of a wake…