Withdrawn
Core Supplement
Ductwork Specification
Divided into eight main parts; technical information to be provided by the designer; standards; rectangular ducts; circular ducts; flat oval ducts; hangers and supports; general and; appendices.
Superseded by DW/144 Specification for sheet metal ductwork. Second edition (BES, 2013). Including Appendix M revision 2002.
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Now known as Building and Engineering Services Association. The Heating and Ventilating Contractors' Association represented those responsible for the design, installation, commissioning and maintenance of heating, ventilating, air conditioning and refrigeration products and equipment. HVCA changed name to the Building and Engineering Services Association (B&ES) on Thursday 1 March 2012.
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
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