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dw-142 specification for sheet metal ductwork addendum-a. Report. Post on 18-Nov-2014. 805 Views. Category: Nov 18, 2014 - Dec 10, 2013 - Dw 142 Specification For Sheet Metal Ductwork Addendum A. 0; 0. November 2019; PDF. Bookmark; Embed; Share; Print. Download. This document was Get this from a library! DW/142 : specification for sheet metal ductwork : low, medium and high pressure/velocity air systems. Addendum A.. [Heating and Feb 17, 2017 - the DW/142 Specification for Sheet Metal F Ductwork published by the Heating and Ventilating Contractors' Association has gained national and international Specification for sheet metal ductwork No. DW 142 and Addendum. "A" 1988 for low, medium and high pressure / velocity air systems published by heating, Mar 6, 2018 -Oct 18, 2015 -