Posted on May 3, 2019


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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Classification using data from fire resistance tests on components of smoke control systems.

Flexible joint connections are manufactured by specialists from the specified ductwrok as plain sleeves or sleeves with flanges at one or both ends. The surface finish is just as critical in determining the corrosion resistance of Stainless Steel as the grade. Intumescent dampers without a cold smoke leakage prevention device will only achieve an E classification to BS ENas they have no cold smoke leakage performance to achieve ES.

HVCA DW – Free Download PDF

These products are not allowed to have self-certification. The system designer may, for example, indicate that a particular system is tested as follows: Vw144 use of natural resources.

Areas where the galvanizing has been damaged or destroyed by welding or brazing shall have a suitable protective coating applied as defined in Section Fire resisting ducts and fire dampers BS EN Fire classification using data from fire resistance tests on components of smoke control systems Reference Ducts for ventilation, pressurisation and kitchen extract Smoke control ducts etc. Foams should not be used where there is a likelihood of airborne contaminants which can reduce the ability of the foam to resist the spread of flame, such as grease from kitchen extract systems.

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No paint protection is required.

This seam is acceptable for use on low and medium pressure ducts only. Users should ensure that they consult with the latest version. The blades shall be simultaneously adjusted by a quadrant or similar operating mechanism.

BS EN — 3 or 4 define how to give a fire resistance classification as a result of testing. The information in this section is based largely on information kindly supplied by the following two associations: Aluminium ductwork is not suitable for kitchen extract.

Kent Ductwork Manufacturer Of Galvanised Ductwork DW

Duct sizes with an aspect ratio greater than 4: The CPR becomes a statutory requirement in each European country when it is incorporated in national Building Regulations. The fire damper must be able to close against static air conditions when mounted in either the vertical or horizontal fw144.

Dampers along the path have to be open and remain open. No individual damper blade should exceed mm in width. Fire resistant ductwork dw1444 by Product Standard prEN will Within F of the standard is qualified t require mandatory mark. Distortion shall be kept to a minimum.

A responsible person should be asking for all the Regulation 38 documentation when a building is handed over. Your Web browser is not enabled for JavaScript.

Lapped sheet joints with a combination of spot welding and duct sealant is also acceptable. Specifications and test methods. Single-blade dampers double-skin section are suitable for use in rectangular ducts, and shall have suctwork maximum duct width of mm dctwork a maximum height of mm.

Building Engineering Services Association A trade organisation meeting the needs of building engineering services contractors involved with design, installation, sw144, maintenance, control and management of engineering systems and services in buildings. This approach would realise the following benefits: A competent installer should deliver a fully sealed system providing a low maintenance, long life solution.


Having considered the scope and the design of the ductwork system relative to the guidelines outlined in J.

Duct work construction to DW/144

Please enter the message. Test results achieved for vertical ducts A and B are applicable to vertical ducts only. Document Status Indicators The Green document status indicator indicates that the document is: It was established in as the National Association of Master Heating and Domestic Engineers and has been through a few name changes since, including: Care shall be taken to ensure that the integrity of any vapour seal is maintained and reference in this respect must be made to both BS and BS If users and system designers are in doubt as to which material is appropriate to a particular application, technical advice may be obtained from from the British Stainless Steel Association www.

wd144 Method for classification of the surface spread of flame tests for materials. Single blade fire dampers may provide an E or ES classification to BS ENdepending on their individual design, their proposed method of installation and the construction they are to be mounted in to.

The corrosivity is influenced by: Additional design allowance to be made for wire supports set at an angle to the vertical.

However site handling facilities along with vehicular access restrictions may influence the type and size of transport to be utilised.