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The Knowledge Base for LEV

ACGIH Manual of Recommended Practice for DESIGN: NEW 30th Edition!!

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NEW 2019 EDITION! NOW AVAILABLE! Now in its 30th Edition Since the 26th Edition, this industry standard LEV Manual has undergone several major changes and upgrades Additions include chapters on – “Organization and Evaluation of Systems”; “Metric Solutions and Tables”; and “Calculation Sheets and Methods”. This (2019) 30th Edition, incorporates changes in many of the…

Welding Fume IARC Monograph 118

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In February 2019 HSE announced that Welding Fume was to be considered a human carcinogen.  This has had a major impact across a wide range of industries and employers. Questions are arising as to what elements of the welding ‘fume’ are implicated and what control responses would be appropriate. This Monograph is the original document…

HSE Work Plan 2019-2020 – Asthmagems, Carcinogens & Respirable Crystalline Silica

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HSE have set our their Work Plan for the coming byears with particular focus on targeting sectors where carcinogens, asthmagens and RCS are regularly used, produced or process generated. They have stated that they will deal with the underlying causes of poor risk control i.e. failures in health and safety management arrangements. These include the…

HSE – Welding Fume – Changes in Enforcement

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In February 2019 HSE released a Press Note which advised of the new health warning status of welding fume.  The main points made were:- New scientific evidence that exposure to all welding fume, including mild steel welding fume, can cause lung cancer. Also limited evidence linked to kidney cancer. Now a change in HSE enforcement…

Video – “How to Measure Captor Hood Control Distance?”

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Latest OXYL8 LEV training video (Sept 17) on YouTube discusses the ways in which we can approach the verification of the Control Distance of a particular Captor Hood. More usually we use smoke release on the centreline out from the hood face until the first ‘whisp’ of smoke is not controlled.  From there most surveyors…

Video – “Captor Hoods – Basic Principles and Design Theory/Equations”

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Latest OXYL8 LEV training video (Aug 17) on YouTube which provides an introduction to the basic operational principles of Captor Hoods and an outline of the mathematical theory for Captors. Fletchers Nomogram equations are discussed and reference made to an OXYL8 (free to download) Excel spreadsheet which will do all the hard number crunching for…

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.

HSG 258 CONTROLLING AIRBORNE CONTAMINANTS AT WORK – A GUIDE TO LOCAL EXHAUST VENTILATION (LEV) – copy

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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…

Video – “What Happens When a Centrifugal Fan Runs in Reverse”?

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Latest OXYL8 LEV training video on YouTube which shows what happens when a Centrifugal fan is incorrectly wired (ie phases the wrong way round) – a situation which is all too common (estimated that approx 7% are incorrectly wired). The key point to note – and shown very well on the video – is that…

Poultry House Ventilation

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Came across this interesting article on the subject of Poultry House Ventilation.  Great resource for anyone involved with chicken and other poultry accommodation ventilation.  Very topical in early 2017 with the Bird Flu housing requirements for all domestic birds/poultry. Download a copy here: Poultry Ventilation_chapter7