![]() Update and consolidate much of the information contained in the original DW/142 The new specification recognises the computer age - with special reference toĬAD/CAM procedures and techniques - and the international performance standardsĮstablished by the Committee for European Normalisation (CEN), as well as the need to This new publication - designated DW/144 - represents the direct result of that Task of producing a radically revised specification which would promote best practiceĪnd quality standards well into the next Millennium. It was an acknowledgement of this state of affairs which led the Technical SubCommittee of the Ductwork Group, ably chaired by Edgar Poppleton, to undertake the Which have taken place since the drafting of DW/142 have rendered obsolete significant ![]() HVCA Ductwork Group that the developments in technology and working practices In recent years, however, it has become increasingly evident to the members of the Published by the Heating and Ventilating Contractors' Association has gained nationalĪnd international recognition as the industry standard against which the quality ofĭuctwork manufacture and installation can be judged. For more than a decade-and-a-half, the DW/142 Specification for Sheet Metal Ductwork
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