HVCA DW August 16, | Author: pheed5 | Category: Duct (Flow), Specification (Technical Standard), Screw, Building, Building Engineering. DW/ is recognised throughout the UK as the Standard Specification for ductwork manufacture and installation. It came into being in when it replaced. Kent Ductwork manufactures standard galvanised ducting to the DW specifications, which achieves all of the current BS, EN & ISO standards.

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This is particularly relevant in view of the definition of acceptable dust accumulation levels in new ductwork as set out in Clause A. For example, some large systems could well be classified for leakage limits as follows: You may have already requested this item. The E-mail Address es field is required.

Although there is no precise formula for calculating the level of air loss, it is generally accepted that leakage will increase in proportion to pressure to the power of 0. Alloys and are easy to braze, as isbut ductwoork latter needs to be reheat treated to regain its strength.


The CPR builds on the success of the CPD, by allowing construction products that have been assessed against harmonised standards to be legally placed on the market anywhere in the European Economic Area.


Also take into account any material acceptance rules imposed by the main contractor. The product construction standards require that the duct is tested to at least one of the following test standards. Humidity Solutions is the UK’s leading independent specialist in humidity control, with access to a vast range of industrial and commercial humidifiers and dehumidifiers from some of the world’s best manufacturers.

Dw1444 competent installer should deliver a fully sealed system providing a low maintenance, long life solution. In the case of fire-resisting duct systems particular care must be taken to ensure that any retro-fitted access panels are suitably fitted, under licence to the fireresisting systems manufacturer. This site uses cookies to give you the finest experience possible.

DW Specification for Sheet Metal Ductwork – The BESA

Examples of such a treatment dductwork T-Wash and Etch Primer types. Fixings and fastenings should be of the appropriate grade of Stainless Steel as used in the construction of the ductwork. En, grade FEP 01A. The conditions for factory and site storage are the same, however it is appreciated duplicating factory conditions on site is not always possible. Galvanized surfaces require chemical pre-treatment prior to painting.

They can be self-adhesive or bonded using a duftwork agent but the surface preparation required to ensure a lasting bond requires vigorous adherence to the surface preparation. Changes at the top for Polypipe. The test standard for fire resisting ductwork is BS EN Where independent support is not deemed necessary it shall be standard practice, as Figs.


Appendix M revised August Specifications and test methods. Please enter your name. Fasteners resulting in an unsealed aperture shall not be used. Single compartment smoke extraction ducts.

Printable View E-mail Bookmark. Leakage testing should always be done under dw1444 pressure even when the ductwork is to operate under negative pressure. 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.

HVCA DW – Free Download PDF

The length of such flexible ducts should be kept to a minimum consistent with the particular application. A widely used grade of this type is designation 1.

Repeated bending is not recommended. It increases the protection against fingerprints. Material compatibility of sheet, section and fixings is not always assured in practice due to commercial availability.