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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BS EN — 3 or 4 define how to give a fire resistance classification as a result of testing.
Steel products shall be protected against corrosion and supplied in a fully assembled condition as specified by the system designer. Classification using data from fire resistance tests on products and elements used in building service installations: Generally they are called for where ducts penetrate walls or floors which form fire compartmentation. Refrigeration and Air Conditioning Informative publications on systems designed to control temperature, humidity and ductwok quality in a defined space Read More.
However, the pickling process does not generally remove grease, oil or oil-based paint, and such substances should be removed by the manufacturer by the use of suitable methods before the component to be treated is delivered to the galvanizing works. The UK’s ddw144 professional body for building engineering services contractors. The implementation of an EMS is essentially a voluntary initiative which requires you to examine your practices and determine how your impacts should best be managed.
At the design stage, it is possible to forecast with reasonable accuracy the total loss from a system by calculating the operating pressure in each section, the surface area of the ductwork in each corresponding pressure section and the allowable loss at the operating pressure for each section.
The damage to the zinc coating is negligible in most cases. Create lists, bibliographies and reviews: English View all editions and formats. Please copy and paste this embed script to where you want to embed Embed Script. Forming and general characteristics are similar to the 1. The extent of any vapour sealing of ductwork and the support method to be used must be clearly specified in advance by the system designer.
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, chemical resistance and ds144 relevant properties.
DW 144: Specification for Sheet Metal Ductwork
F marked by 1 July Heat Pump Guide TR In cases such as this example the system designer can specify an improved standard of airtightness, i. It has little specular reflectivity. These standards for smoke control ductwork and dampers may become applicable within the life of this standard and then similar procedures should be followed as that which are followed for fire dampers above, but using the published standards for smoke control products.
Refer to right hand page opposite for additional information relating to Notes 10 to 13 in Table 4. Distortion shall be kept to a minimum. The Amber document status indicator indicates that some caution is needed when using this document – it is either: The length of such flexible ducts should be kept to a minimum consistent with the particular application.
The test standard for fire resisting ductwork is BS EN Ductwork made from insulation duct boards. With socket and spigot joints, care should be taken to ensure that the dimensions of ducts and fittings are correctly related. The insulation and vapour barrier should be abutted to the insulator incorporated into the duct support.
Building regulations and ductwork leakage testing
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 Dutcwork Thermal Insulation Contractors Association both of whom have jointly provided the information in this section. In all cases the paint manufacturer should be consulted regarding suitability for the intended application.
Rolled steel angle bearers are shown in Fig. Joint sealing materials are set out in Part Seven, Section Fixing bolts required at each corner and at mm centres.
Using suitable precautions when handling, transporting and installing the ductwork will help to minimise un-necessary damage.
In the case where galvanized sheet steel ductwork is clad with the application of protective material, the ductwork construction must be as type tested and comply with the protective material manufacturers recommendation, e.
The galvanizing process induces a great deal of stresses into the duct panels, which tends to distort the panels. 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. Panels shall also allow access to the blades and fusible links.
Galvanised Ductwork – Galvanised Ductwork DW 144
The fire damper shall be able to operate in either or both the vertical and horizontal planes. Safety in case of fire.
Fasteners resulting in an unsealed aperture shall not be used. Full guidance with regard to risk assessment, maintenance etc is given in the RRFSO or its associated guidance. The ductwork construction and joint sealing standards are set out in Part Seven, Section Swimming pool buildings have the additional complication of a large variations in conditions which can exist in a pool environment.
If required, in the event of a signal from a remote sensor this would be achieved by an actuator, electric solenoid, electromagnet or other device.
Non-combustibility test for materials. Cleanliness of ventilation systems. The same methods are applicable to vertical flat oval ducts. Existing white rust deposits will slowly convert to a protective basic zinc carbonate.
Kent Ductwork Manufacturer Of Galvanised Ductwork DW
The Red document status indicator indicates that the document is an old version The document has likely been withdrawn by the publisher, also the meta data presented here may be out of date as it is no longer being maintained by the editorial teams at NBS.
Fixings and fastenings should be of the appropriate grade of Stainless Steel as used in the construction of the ductwork. The use of third party certificated products and installers is clearly recommended. Classes then increase 1 to 4 with Class 4 being the most leak-tight.
CE marking requires full testing supported by third party certification.