DW/144 - Metal Product

1 DW144 (11112) Dec13 PART 1_Layout 1 16/05/2014 16:05 Page 1. BuilDing & EnginEEring SErvicES ASSociAtion SPECIFICATION FOR. Licensed copy from CIS: HOARE LEA & PARTNERS, 26/11/2014, Uncontrolled Copy. SHEET Metal DUCTWORK. DW/144 Second Edition 2013. Licensed copy from CIS: HOARE LEA & PARTNERS, 26/11/2014, Uncontrolled Copy. DW144 (11112) Dec13 PART 1_Layout 1 16/05/2014 16:05 Page 2. DW144 (11112) Dec13 PART 1_Layout 1 16/05/2014 16:05 Page 3. Licensed copy from CIS: HOARE LEA & PARTNERS, 26/11/2014, Uncontrolled Copy. DW/144 . Specification for Sheet Metal Ductwork Low, medium and high pressure/velocity air systems 2013.

2 Copyright 2013 by the Building & Engineering Services Association All rights reserved iSBn 978-0-903783-64-4. Publishing History: First Edition (1998). Second Edition (2013). further copies of this publication are available from: B&ES Publications old Mansion House, Eamont Bridge, Penrith, cumbria, cA10 2BX. tel: 01768 860405, Fax: 01768 860401. Email: 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.

3 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). DW144 (11112) Dec13 PART 1_Layout 1 16/05/2014 16:05 Page 2. Building & Engineering Services Association 2 SPECIfICATION fOR SHEET Metal DUCTWORK. THE INDUSTRY STANDARD. Licensed copy from CIS: HOARE LEA & PARTNERS, 26/11/2014, Uncontrolled Copy. B BLane Bob Peter Peter Rogers Rogers Peter Rogers chairman Chairman Chairman chairman Executive executive Committee Executive Committee committee Technical Committee Technical technical Committee committee Ductwork Group Ductwork Group Ductwork Group Ductwork Group Ductwork Group Ductwork Group Since its publication in 1998, the Association's Specification for Sheet Metal Ductwork DW/144 has gained national and international recognition as the standard against which the quality of ductwork manufacture and installation can be measured.

4 However, developments in technology and working practices, along with the need to reflect a steady proliferation of European standards, have rendered necessary a far-reaching revision of the original edition. this second edition is the result of many years of work by members of the technical committee of the B&ES Ductwork group (DWg), who have expanded the content on such subjects as: supports and hangers;. smoke and fire dampers;. external ductwork;. internal duct linings;. thermal insulation;. air terminal units;. fire-resisting ductwork;. ductwork for swimming pools, etc.

5 Of course, a key element of any such review is to ensure that the specification continues to o er realistic benchmarks to which all individuals and organisations are able to perform. DW/144 now incorporates B&ES publication, Acceptance Scheme for new Products: rectangular cross Joint classification (DW/tM1), which establishes performance ratings for both air leakage and deflection for cross-joints. in order to validate the parameters set out in DW/144 , B&ES has undertaken extensive testing against recently-introduced cEn requirements to measure panel/flange deflection and air leakage testing.

6 Testing has also been undertaken to determine the lifespan of untreated DW/144 spot welds over a 30-year period. 2 2. the results have allowed the DWg technical committee to make a DecDec 20132013. number of recommendations in relation to the construction of ductwork which o er a significant commercial advantage. these include: DW144 (11112) Dec13 PART 1_Layout 1 16/05/2014 16:05 Page 3. Building & Engineering Services Association SPECIfICATION fOR SHEET Metal DUCTWORK 3. lighter gauges of steel;. Licensed copy from CIS: HOARE LEA & PARTNERS, 26/11/2014, Uncontrolled Copy.

7 A reduction in the number of gauge, flange/sti ener manufactured assemblies;. dispensing with the need to treat spot welds;. a reduction in coatings thickness/protective finishes;. further clarification of standard duct sizes used. During the drafting process, the DWg technical committee has consulted widely with individuals and organisations throughout the building engineering services and construction industry to ensure that the new specification fully reflects the current state-of-the-art in terms of both technical expertise and industry best practice.

8 We firmly believe that this process has resulted in a publication that clearly demonstrates the high level of professionalism which exists within the ductwork community . and we take this opportunity of thanking all those who have contributed to its production. in particular, we have worked closely with members of the drafting panel for the ventilation Hygiene Branch's guide to good Practice: cleanliness of ventilation Systems (tr/19), as well as representatives of the following organisations: Aluminium Federation ltd (AlFED);. British Stainless Steel Association (BSSA).

9 Building Services research and information Association (testing). (BSriA);. galvanizers Association;. Heating, ventilating and Air conditioning Manufacturers Association (HEvAc);. Sheet Metal and Air conditioning national contractors' Association (SMAcnA);. tAtA Steel;. thermal installation contractors' Association (ticA);. thermal insulation Manufacturers and Suppliers Association (tiMSA);. in addition, the past 15 years have witnessed a number of significant legislative and regulatory innovations including the construction Products regulation, cE Marking and the construction (Design and Management) regulations, along with other measures designed to enhance environmental management and health and safety.

10 The latter comprise significant developments within the Building regulations in England and Wales, with the result that the classes of ductwork to be tested under the regulations have been clarified within DW/144 , along with the re-introduction of high-pressure class D to conform to European practice. to ensure that companies are fully informed and understand the wealth of information that surrounds our industry we have compiled a new reference document commentary and guidance to DW/144 '. the information contained in this new document is additional supplementary material to support DW/144 and is explanatory in nature.