DW Specification for Sheet Metal Ductwork – The BESAįind out more about how BESA can help your business and the benefits available to members. In describing flat oval ductwork, the major axis is referred to as the width W and the minor axis is referred to as the depth D For tie rod requirements see Tables 13 and Kitchen extract ductwork presents a particular hazard as combustible deposits such as grease are likely to accumulate on d144 surfaces, therefore all internal surfaces of the duct must be smooth.įorming and general characteristics are similar to the 1. In contrast to international standardization, it can have a standarf role in certain cases. The load-bearing capacity of the construction can be assumed for a specific period of time. DW 144: Specification for Sheet Metal Ductworkįlexible ducts shall be securely fastened at each end using a proprietary band such as a plastic tie-wrap.
Where readings are required, the test holes should be made in rigid ductwork. In certain instances it may be necessary to employ the services of an external Safety Consultant and details of their involvement must be included in the statement. Low, medium and high has gained national and international recognition as the industry standard. Air leakage of the assembled unit shall be to HVCA Standard DW/ Duct Work Construction to DW/ DW/ is recognised throughout the UK as the Standard Specification for ductwork manufacture and installation. (a) DW/ Specification for sheet metal ductwork (low-medium- and high pressure).
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