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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You may have already requested this item. The intumescent materials form the main component for fire integrity.
Find out more about how BESA can help your business and the benefits available to members. 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.
DW standard – Pro-Duct Clean
This document Older versions. The requirements for direct field of application of the test results of all duct tested to BS EN apply together with the following; a. If required, in the event of a signal from a remote sensor the fire damper blades shall be released and close the airway. Linked Data More info about Linked Data. The system designer may, for example, indicate that a particular system is tested as follows: Such sealant shall be in accordance with the requirements of Part Seven, Section The basic requirements for storage are: 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.
The principal mechanism for achieving this is through the replacement of existing national standards and technical approvals with a single set of European-wide technical specifications for construction products i. See Figs to In all cases the paint manufacturer should be consulted regarding suitability for the intended application. Please enter the message.
DW Specification for Sheet Metal Ductwork – The BESA
Minimum steel thicknesses related to duct dimensions are given in Table Having considered the scope and the design of the ductwork system relative to the guidelines outlined in J. Persons responsible for compliance with AD7 are people who are responsible for building work e. The fire damper shall be able to operate in either or both the vertical and horizontal planes. We dw44 your help! Cancel Forgot your password?
HVCA DW 144
Classification using test data from reaction to fire tests. The Amber document status indicator indicates that some caution is needed when using this document – it is either: Arrangements of circular supports for plain and insulated ducts are shown in Figs.
The tested duct assembly is judged against five performance criteria. Under the new CDM Regulationsclients must take reasonable steps to ensure that: A local excess temperature in the area of the fire damper shall, independent of any remote sensors, automatically release the blades and close the airway by means of the thermal release mechanism.
Larger distances between floors than 5m. If the need arises ductwork stored in the factory should be stored in such a manner to prevent damage and be readily accessible for delivery in accordance with the installation programme.
The inset frames shall be constructed to maintain the structural integrity of the wall and where applicable cavities shall be suitably lined. Illustrations indicating sealant locations will be found in the sections dealing with the construction of rectangular, circular and flat oval duct sections. Representing the interests of firms active in the design, ducgwork, commissioning and maintenance of heating, ventilating, air conditioning and refrigeration hvacr products and equipment.
DW 144: Specification for Sheet Metal Ductwork
One, two and three sided ductwork is not yet covered by this test standard but this test standard is under development prEN Otherwise, supports may be as for un-insulated ductwork, i. Water based sealants should not be used on external ductwork.
Write a review Rate this item: Please enter your name. More information on coatings is available from the two sources listed at the end of this Note. 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. BS – Code of practice for fire safety in the design, management and use of buildings This standard gives a large amount of information to support ADB.
Alloys and are easy to braze, as isbut the latter needs to be reheat treated to regain its strength. Again there may be more recent versions of the document. Commentary and Guidance — Note 4. Minimum steel thicknesses related to duct diameter are given in tables 8, 9 and The test standard for fire resisting ductwork is BS EN The drop rod should be tested inside the furnace and subject to the maximum weight ductworl the ductwrok rod would have to bear in practice.
These have now essentially been replaced by the single BS standard. Ductqork is due to the naturally occurring chromiumrich oxide film which is present on the surface of the metal, if damaged, reforms immediately by reaction between the metal and the atmospheric or other source of oxygen.
The materials used should be suitable for the purpose intended and satisfy the specified pressure classification. This means that dampers at the fire have to be dw14 and remain open. Hygiene, health and the environment.