DW-144-1998 国外国际标准.pdf

Specification for Heating and Sheet Ventilating Contractors’ Metal Association Ductwork DW/144 DW/l44 Specification for Sheet Metal Ductwork Low, medium and high pressure/velocity air systems 1998 Copyright © 1998 by the Heating and Ventilating Contractors’ Association All rights reserved ISBN 0-903783-27-4 Further copies of this publication are available from: Publications Unit Heating and Ventilating Contractors Association Old Mansion House Eamont Bridge Penrith Cumbria CA10 2BX Tel: 01768 864771 Fax 01768 867138 e-mail: hvcapublications@hvwelfare.co.uk THE INDUSTRY STANDARD Ken Parslow Chairman Executive Committee Ductwork Group 1996-98 or more than a decade-and-a-half, the DW/142 Specification for Sheet Metal FDuctwork published by the Heating and Ventilating Contractors’ Association has gained national and international recognition as the industry standard against which the quality of ductwork manufacture and installation can be judged. In recent years, however, it has become increasingly evident to t