TR19 PREVIEW

Building Engineering Services Association Guide to good practice INTERNAL CLEANLINESS OF VENTILATION SYSTEMS TR 19® JULY 2019 www.theBESA.com

Building Engineering Services Association Guide to good practice Acknowledgments INTERNAL The BESA records its appreciation and thanks to the many CLEANLINESS OF persons and organisations who have freely given information VENTILATION on various aspects of this work, in particular to the following SYSTEMS members of the ventilation Hygiene Branch who contributed their knowledge and experience to this later edition: TR/19 Craig Booth Paul Downing George Friend Alan Gregory Gareth Keller Steve Lorriman Gary Nicholls Richard Norman Nick Tregaskes Peter Reid Nick Umfreville Special thanks are offered to J Bridges for his assistance in the development of the deposit Thickness Test, and to T Mulhall of the HSE. ISBN 978-0-903783-65-1 Publishing history: First published as DW/TM2 (1991) and TR/17 (1998) Second Edition (2002), TR/19 (2005) and TR/19 (2013) Third Edition (2019) ©2019 BESA JULY 2019 BESA Publications Old Mansion House Eamont Bridge Penrith CA10 2BX 01768 860405 [email protected]. www.theBESA.com

Building Engineering Services Association Foreword Guide to good practice As air is invisible there is a tendency to take the quality of the air we breathe for granted. Moreover, given that the average person has an air INTERNAL intake of about 3.4 litres of air every minute, the dangers of an inadequate CLEANLINESS OF or polluted air supply are obvious.This, coupled with the risk of fire VENTILATION from build up of grease deposits in kitchen extract systems and the SYSTEMS expectations of building occupiers and legislators, has resulted in an ever more stringent level of ventilation system cleanliness being required. TR/19 This association first published TR/17 in 1998 in order to give guidance to good practice and to establish standards for testing, cleaning and verification of the internal cleanliness of ventilation systems. The guide was re-published in 2005 to include further improvements to best practice and to incorporate the former publication DW/TM2 – Internal Cleanliness of New Ductwork Installations. To differentiate this expanded edition from its predecessor publication, it was renumbered TR/19. The opportunity was been taken in the second Edition of TR/19 to incorporate reference to the new British and European Standard BS EN 15780 Cleanliness of Ventilation Systems introduced in 2011. Also changes were made to highlight the current best practice for ensuring that kitchen extract systems are maintained to minimise the risk of fire associated with grease accumulation. Kitchen extract systems are not covered by BS EN 15780. In this Third Edition, Section 7 has been withdrawn and has been superseded by TR19® Grease, a new, stand-alone specification for Fire Risk Management of Grease Accumulation within Kitchen Extraction Systems. The guide can be used for new build, upgrade and maintenance of ventilation systems and will directly benefit users of the indoor environment as well as specifiers and consultants. Since its inception in 1998, this guide and its predecessors have been widely accepted within the building services sector and by the UK insurance industry as the standard to which ventilation systems should be cleaned. BESA would like to thank members of the BESA ventilation Hygiene Branch and the many persons and organisations who have contributed to this guide. www.theBESA.com



Building Engineering Services Association 3 INTERNAL CLEANLINESS OF VENTILATION SYSTEMS TABLE OF CONTENTS Page Foreword 2 1 introduction 5 2 new ductwork system cleanliness 8 3 Design and access to the internal surfaces of the ventilation system 11 4 Specific considerations for system components 15 Air handling units & other system components 15 Access to air handling units 15 Filters 15 linings 16 Moisture 16 Heating, cooling coils and heat exchanger coils 16 Heat recovery coils, thermal wheels, cross-over coils 17 Fans 17 Sound attenuators 17 Turning vanes, volume control dampers 17 Fire dampers 18 ductwork 18 Steel ductwork 18 Flat or oval ductwork 18 Phenolic ductwork 18 glass-fibre reinforced plastic(‘gRP’) 18 Air socks 18 chilled beams 18 Fire cladding and fire-rated ductwork 19 Flexible ducts 19 diffusers and grilles 19 Terminal equipment 20 Plenum void 20 5 System risk assessment (inspection/monitoring/testing) 21 legislation - health and safety law 21 Monitoring (inspection and testing) frequency 21 recommendation identification and assessment of risk 22 Testing procedures 23 Preferred vacuum test (‘PvT’) 24 deposit thickness test (‘dTT’) 24

Building Engineering Services Association 4 INTERNAL CLEANLINESS OF VENTILATION SYSTEMS 6 cleaning Methods Page considerations when using dry cleaning methods considerations when using wet cleaning methods 26 Mechanical brushing 26 compressed air whip/skipper ball 26 Air lance 26 Hand wipe 27 Hand vacuum 27 Hand brushing 27 Hand scrape 27 27 7 Specific considerations for kitchen extract systems 28 Section 7 of this document has been withdrawn and superseded by TR19® Grease, a new, stand-alone 29 specification for Fire Risk Management of Grease Accumulation within Kitchen Extraction Systems. 29 8 Hazardous contamination 30 30 9 verification of cleanliness Acceptable dust accumulation levels for newly installed 31 ductwork 31 Acceptable post-clean level 31 Timing of post-clean verification testing completion report 32 10 Health and safety 33 35 Appendix A Annex F from BS En 15780 38 Appendix B Microbiological contamination 39 Appendix c legislation and guidance 41 Appendix D cleaning contractor selection 45 Appendix E Testing methods 46 Appendix F Quick guide 1: Air ductwork systems Appendix H Bibliography