TR40 PREVIEW

A Guide to Good Practice for: LOCAL EXHAUST VENTILATION TR40 MAY 2020 WWW.BESA.COM

Acknowledgements The BESA records its appreciation and thanks to the many people and organisations who gave advice and information during the preparation of this joint Guide to Good Practice, in particular to those members of the expert panel who contributed their time, experience and knowledge. TR40 EXPERTS PANEL Jane Bastow Rob Mackay Adrian Sims Phillipe de Wilde The BESA also records its appreciation and thanks for the expert advice and guidance provided by The Institute of Local Exhaust Ventilation Engineers (ILEVE), established to promote air quality in the workplace and to reduce ill health and death due to airborne contamination and hazardous substances in the working environment. NOTE: This document is based on knowledge available at the time of publication and is meant for general purposes, not for reliance on in relation to specific technical or legal issues, in which case you should always seek independent advice. No responsibility of any kind for any injury, death, loss, damage or delay however caused, resulting from the use of the advice and recommendations contained herein, is accepted by the authors or others involved in its publication (including the Building Engineering Services Association, the Institute of Local Exhaust Engineers The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation 1

Foreword The Health and Safety at Work Act 1974 (HASAWA) places a duty on all employers 'to ensure, so far as is reasonably practicable, the health, safety and welfare at work' of all their employees and others in the workplace. The Health and Safety at Work Act 1974 allows the government to issue regulations, guidance and Approved Codes of Practice (ACOPs) which set out detailed responsibilities for employers in every aspect of workplace health and safety. A publication produced jointly by the Building Engineering Services Association BESA and the Institute of Local Exhaust Ventilation Engineers (ILEVE), TR40: A Guide to Good Practice for Local Exhaust Ventilation is a comprehensive guide for employers, designers, suppliers, project managers, LEV commissioning engineers, employer-appointed LEV responsible people, LEV trainers and all other employees who design, commission, operate and maintain LEV systems. It contains information about the various roles and the associated legal and statutory responsibilities and tells people what they should do and when to do it to ensure the LEV process from start to finish provides effective solutions to control exposure to hazardous substances. Also included is guidance on identifying LEV competency – skills, experience and knowledge, training, the importance of keeping records, what to look for, what to ask when evaluating LEV tenders and quotations, and the installation and commissioning process through to handover. To complement this guidance and to better understand the responsibilities of the employer and the role of LEV in protecting the workforce, TR40 should be read in conjunction with the HSE publication HSG258 - Controlling airborne contaminants at work - A guide to local exhaust ventilation (LEV), which provides employers with further guidance on the design of new local exhaust ventilation (LEV) equipment. TR40 supports the principles of the government’s ‘Helping Great Britain Work Well’ strategy by providing simple, accessible and relevant advice to facilitate proportionate, appropriate and effective risk management, encouraging all those in the system to take much greater ownership of health and safety and ultimately help Great Britain work well. ‘Helping Great Britain Work Well’ 2 The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation

Contents Acknowledgements 1 Foreword 2 Contents 3 Sections Section 1 Introduction 5 Section 2 Roles and Responsibilities 9 Section 3 How to identify LEV competency 16 Section 4 Employer brief and design parameters 24 Section 5 LEV system specification 26 Section 6 Evaluating LEV tenders and quotations 32 Section 7 Installation program 34 Section 8 Operating and maintenance manual 35 Section 9 Commissioning 38 Section 10 Training 41 Section 11 Log Book 42 Section 12 Handover Documents 44 Section 13 TExT (thorough examination and testing) 45 Appendices Appendix A Simple Handover Form 54 Appendix B Glossary of Terms 55 Appendix C References 56 Appendix D Resources and training 60 Figures Figure 1 Roles and Responsibilities through 8 the LEV process Tables Table 1 Minimum frequency of filter replacement 28 53 Table 2 Statutory maximum interval between inspections The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation 3

SECTION 1 Introduction Every employer must ensure that the exposure to substances hazardous to the health of his or her employees is either prevented, or, where this is not reasonably practicable, adequately controlled. An employer’s overriding duty and first priority is to consider how to prevent employees being exposed to substances hazardous to health by all routes. 1.1 What is LEV? Local exhaust ventilation plant (LEV) is used to control and reduce the inhalation of substances hazardous to health in a workplace, such as dust, gas, mist, fumes or vapour. In the Control of Substances Hazardous to Health Regulations (COSHH), LEV is referred to as an ‘engineering control’. 1.2 Why LEV is needed LEV equipment reduces the exposure of workers to airborne hazardous substances in the form of dusts, mists and fumes. Typically, these substances may cause respiratory disease: industrial asthma, cancer and chronic obstructive pulmonary disease (COPD). Often, operatives such as bakers, motor vehicle repair workers, paint sprayers, solderers, stonemasons, welders or woodworkers, who work with the hazardous substances in the everyday aspect of their work, are not aware of the health hazards involved if they inhale substances regard as routine. Many manufacturing and production processes create dusts, mists and fumes that need to be controlled if they cannot be reduced or eliminated by changes to the production methods. 1.3 The need for competent advice LEV systems perform an essential function to protect health. They must be properly designed, installed, commissioned, tested and maintained to be effective. It is essential that employers ensure that they use competent LEV engineers. 1.4 Examples of LEV equipment LEV may be fixed or portable, and includes items such as: MicroCSbaaiobfleiontgyeitcsal Dust or RBoooSompthray Extraction Units Fettling Fume Extraction On Tool Booths Extraction Down Fume Draught Solid Fuel Cupboards Tables Burning Kitchen Air Movers Equipment The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation 5

The use of the equipment determines if it is LEV. A vacuum cleaner used to connect to a source of dust to reduce the likelihood of breathing in the dust is LEV and should comply with the advice in this Guide to Good Practice. A vacuum cleaner used only to clean floors is not LEV however; this would need to be appropriately specified to be suitable for any hazardous waste that it is used with, so may need to comply with ATEX and have agreed safe procedures for waste emptying and disposal. 1.5 Components of an LEV system An LEV system will include some, but not necessarily all, of these components: • hood(s), where the air and contaminant cloud enters the LEV system • ducting, to transport the contaminant-loaded air from the hood to the • discharge point filter, air cleaner or arrestor, to clean the extracted air (not present in all systems); may be located before or after the air mover, and may be several types of filter in sequence • air mover, to provide the extraction energy and direction of air movement • discharge, to allow the release of filtered air or air loaded with contaminant to a safe place. 1.6 Ancillary items deemed to be part of LEV system Components that do not form part of the LEV ‘unit’ are deemed to be part of the LEV ‘system’ if they are essential to the effective operation of the LEV. For example, the casing or machine guarding on the equipment that is the source of the dust or fumes, or flues from hot processes (such as furnaces and ovens) make up air movers and grilles to replace the extracted air within the workplace. 1.7 Existing LEV modifications The contents of this guide apply to both new LEV projects and the modification of existing LEV systems. Typical modifications to the LEV system may include: • alterations to the motor • a new air mover • a replaced filter • changes to make up air arrangements • ductwork alterations (addition or removal of branches, incorporation of new hoods or connections, increase or decrease in number of inlets in simultaneous use) • changes to the air discharge • changes to waste collection method • relocating components • power supply changes • new or re-programmed control equipment. Where components such as motors and filters are replaced on a like-for-like basis, it may not be necessary to carry out full re-commissioning for every connection on the LEV. However, a sufficiently detailed LEV thorough examination and test (TExT) should be undertaken to prove that the control is still effective, the previous commissioning parameters are still valid and the new component has been correctly specified and fitted. 6 The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation

Changes in the workplace that may affect the LEV include: • use of a different process • changes to plant and machinery • use of new materials • new work practices or changes to duration or intensity of use • building modifications, e.g. add/remove ventilation. When the LEV is modified, ensure that: • the designer confirms that the modified LEV will be fit for purpose and • effective the whole of the modified LEV system is re-commissioned, including evidence of effective control of the hazardous substance • staff are re-trained as appropriate • procedures are in place to ensure all risks from hazardous residues and contaminants within the LEV system are controlled during the modifications. The existing hazardous substances and their properties, such as flammability and explosibility, should be identified in a suitable risk assessment, in accordance with Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) Reg.5, issued by the client, where necessary, including sampling reports. The Building Engineering Services Association Guide to Good Practice - Local Exhaust Ventilation 7