B&ES TR/19
BESA TR19 are the duct-work cleaning guidelines provided by Building Engineering Services Association (BESA) for internal cleanliness of ventilation systems.{{cite web|url=http://www.b-es.org/b-es-connections/technical/compliance/it-pays-to-be-clean/ |title=It pays to be clean |publisher=B&ES |accessdate=7 May 2015 |url-status=dead |archiveurl=https://web.archive.org/web/20150116020119/http://www.b-es.org/b-es-connections/technical/compliance/it-pays-to-be-clean/ |archivedate=16 January 2015 }} The guidelines were introduced in 2005 by amalgamation of pre-existing TR/17 and DW/TM2 guidelines. Once a system is TR19 compliant, it has been found that average total High Risk Combustion Load Levels (HR-CLLs) can be reduced by a total of 83%.{{cite web|url=http://environmentalsciencesociety.org/2013/10/22/fire-risk-the-problem-tr19/ |title=Fire Risk – TR/19 & Informed Decision Making – Ventilation and Environmental Health Risk Assessment – WYG Group Consultant Case Study |publisher=Environmental Science Society |date=22 October 2013 |accessdate=8 May 2015 |url-status=dead |archiveurl=https://web.archive.org/web/20150214191338/http://environmentalsciencesociety.org/2013/10/22/fire-risk-the-problem-tr19/ |archivedate=14 February 2015 }}
History
The BESA TR19 guidelines were introduced in 2005 by updating the old TR/17 guidelines which were in effect from 1998. In 2014, TR19 was updated to reflect changes in European standard BS EN 15780:2011 – Ventilation for buildings – ductwork – cleanliness of ventilation systems.{{cite interview | title=TR/19 update--key concerns addressed. | date=2014 | last=Norman | first=Richard | pmid=25282986}} TR19 was updated to reflect the benchmarks and testing protocols as contained in BS EN 15780.{{cn|date=August 2019}}
The prime changes in TR19 2005 and 2014 versions are introduction of a CQC, testing protocol and test equipment specification, separation of new duct systems from existing systems and introduction of the RRFSO.{{cn|date=May 2021}}