(a) DW/ Specification for sheet metal ductwork (low-medium- and high pressure) .. 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. “It will be. DW/ Specification for. Sheet Metal Ductwork. Low, medium and high has gained national and international recognition as the industry standard.

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DW standard – Pro-Duct Clean

Arrangements of circular supports for plain and insulated ducts are shown in Figs. The design and installation details are important as these will form the basis of any records for risk assessment purposes and how to fix any installation damage that might appear in the future.

Sheet metal air ducts and fittings with circular cross-section. Figures 13 to 19 above are typical examples of cross joint profiles that are in common use for connecting rectangular sheet metal ducts. Such sealant shall be in accordance with the requirements of Part Seven, Section Within the requirements of the European directive, any fire marked by have 1 Julyan The requirements for circular duct fittings apply throughout the pressure ranges covered in this specification.

Adjacent sections of lining should abut with minimal gap and integral or separate surface finish lap to such joints and or gap filling proprietary products being applied.

BS EN Smoke and heat control systems. BS EN Cold rolled low carbon steel flat products for cold forming. Forming and general characteristics are similar to the 1. The characteristics of the particular type of coating contemplated for a particular use should be investigated in respect of formability, fastness to light, resistance to high operating temperatures, sstandard resistance and other relevant properties.


Single-blade dampers double-skin section are suitable for use in rectangular ducts, and shall have a maximum duct width of mm and a maximum height of mm.

Maintenance Agreement EA 1: All test results were proven to be within the new European standards defined in BS En The CPR aims to remove technical barriers to trade for construction products across Europe.

We are a non-profit group that run this website to share documents. Enquiries should be made of the relevant organisation, at the contact details quoted. Further, unless the system designer has specified his requirements in detail, the load to be carried shall be understood to be limited to the ductwork and its associated thermal insulation. Sealant or gasket Turn up minimum of 8mm Note: More highly alloyed grades of Stainless Steel with enhanced corrosion resistance are available if required.

A responsible person should be asking for all the Regulation 38 documentation when a building is handed over and under the above has a legislative right to it m. Leakage testing is always done under positive pressure even when the ductwork is to operate under negative pressure. Also take into account any material acceptance rules imposed by the main contractor. There are compositional variants within this family, designed to give specific formability and welding characteristics.


The movement of ductwork will inevitably involve manual handling. We offer a range of support services to our members including expert technical, legal and employment advice. Details regarding accreditation bodies can be found on the UKAS website – www.

The new regulations standare the Construction Health, Safety and Welfare Regulations and CDM into one single set of regulations which introduce some important changes to the safety regime. In the case where a random test is selected for medium pressure ducts the following clause is syandard for inclusion by the system designer. Aluminium cladding is a more rigid protective finish than most other proprietary weather-proof jacketing systems, and is less susceptible to bird damage.


The same methods are applicable to vertical flat oval ducts. Table 20 that follows, summarises these requirements under the heading of those panels to be fitted by the ductwork contractor. The centres largest distance between suspension devices used in the test construction cannot be exceeded in practice. Immersed components are not at all susceptible to SCC.

Stiffeners shown in Figs 26 to 30 are permitted. They should point out any shortcomings too, although this would probably be seen with regard to blocked escape routes etc, not fire safety installations.

Helium or a mixture of helium and argon can be used, but not C The tested duct assembly is judged against five performance criteria.

Standard Ductwork DW

Hot finished structural hollow sections of non-alloy and fine grain steels. BS EN — 3 or 4 define how to give a fire resistance standaed as a result of testing.

BS EN Aluminium and aluminium alloys.

The blades shall be simultaneously adjusted by a quadrant or similar operating mechanism. Before a grade is specified, the nature of the interior and exterior environments of the ductwork system should be taken into account.

You share liability for the provision of information required under Building Regulation 16B that tells the user of the building about the fire prevention measures provided in the building.

Stainless Steel also finds application in exposed ductwork where the finish can be used for aesthetic reasons.

DW 144: Specification for Sheet Metal Ductwork

BS EN Specification for hot-rolled flat products made of high yield strength steels for cold parts forming. Particular care must standrd taken in the sealing of these joints. The ductwork should have a weathering cravat to fit over the kerb.