(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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Bolts, parts screws, studs and nuts. Details regarding accreditation bodies can be found on the UKAS website – www.

However, any chloride-based material, such as polyvinyl chloride PVCshould be avoided, as breakdown of such material at certain elevated temperatures could lead to corrosion of the Stainless Steel.

Heat Metering TR standarf It is not practical to cover the full range of fixing available, therefore any propriety fixing can be considered if stanfard with manufacturers test data. Worksafe – Safety Facts JS 2: The extracts from BS.

This is applicable only to four-sided rectangular and circular duct.

DW standard – Pro-Duct Clean

Narrow strip and cut lengths. Accreditation is not mandatory.

This means that dampers at the fire have to be open and remain open. The drop rod should be tested inside the furnace stajdard subject to the maximum weight that the drop rod would have to bear in practice. As the air supply creating the pressurisation must be maintained for the duration of the fire, fire dampers cannot be used within the ductwork to prevent the spread of fire as they will close on temperature increase, but use may be made of smoke control dampers, which may open or close depending on their position.

Table 30 Rectangular aluminium ducts — low pressure constructional requirements Maximum duct Minimum sheet size longer side thickness 1 mm 2 mm 0.

The CDM regulationsenforced by Health and Safety Executive, concentrate on managing the risk and the health and safety of all those who build, those that use the standaed, those who maintain it and those that demolish it — cradle to grave.


More information on the implications of the Construction Products Regulation and CE marking is available from the Construction Products Association which has published guidance developed with dw1144 agencies. Classification using data from fire resistance tests on products and elements used in d144 service installations: The Health and Safety Commission HSC recommends that boards appoint one of their numbers to be the health and safety director.

The requirements standarc circular duct fittings apply throughout the pressure ranges covered in this specification. Material compatibility of sheet, section and fixings is not always assured in practice due to commercial availability.

The ductwork should have a weathering cravat to fit over the kerb. Single-blade dampers single-skin section shall have a maximum duct width of mm and a ds144 duct height of mm for rectangular ducts; and for circular ducts a maximum diameter of mm. Dampers shall have casing leakage classes to meet BS EN They should point out any shortcomings too, although this would probably dw144 seen with regard to blocked escape routes etc, not fire safety installations.

Roll formed flange manufacturer to confirm that their proprietary system is suitable for having hangers attached to the top corner of the flange configuration.

Dampers at branches, or on the surface of the duct, along the path must be closed and remain closed. Certain regulations require particular records to be produced, kept or maintained.

Alloys and are easy to braze, as isbut the latter needs to be reheat treated to regain its strength. Fire dampers must have an ES classification for the protection of escape routes. The inset frames shall be constructed to maintain the structural integrity of the wall and where applicable cavities shall be suitably lined.

It shall be standard practice to provide access panels for the inspection and servicing of plant and equipment as listed below. It has little specular reflectivity. Building products excluding floorings exposed to the thermal attack by a single burning item.



Where successive failures are identified there shall be a right to require the ductwork contractor to apply remedial attention to the complete ductwork system. The duct is formed from a spirally- wound circular duct, using a special former. The information in this section is provided for general guidance only and more detailed information on thermal insulation can be obtained from TIMSA Thermal Insulation Manufacturers and Suppliers Association and TICA Thermal Insulation Contractors Association both of whom have jointly provided the information in this section.

It is recommended that a safety factor of 5 to 1 be added to calculations for attachments to the structure BS EN Designers and surveyors should note that bills of quantities should provide a full description of stamdard items required. Whilst this staining often can be removed without harm to the Stainless Steel surface, in aggressive environments corrosion around the contamination can create a risk of pitting of the Stainless Steel.

A ductwork system that has limited air leakage, stzndard defined limits, will ensure that the design characteristics of the system can be maintained. They are aimed at improving the management of health, safety and welfare to reduce the large number of serious and fatal accidents which happen every year in the industry.

According to the Regulations, the requirement for CE marking will apply to: Arrangements for flat oval duct supports are shown in Figs. The implementation of an Environmental Management System EMS can assist a business in managing and meeting its increasingly heavy burden of responsibility for the future protection of the global environment.

HVCA DW – Free Download PDF

The CPR becomes a statutory requirement in each European country when it is incorporated in national Building Regulations. BS EN Extended applications of results from fire resistance tests for service installations.

List of stainless steels.