(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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In certain instances it may be necessary to employ the services of an external Safety Consultant and details of their involvement must be included in the statement.

Where readings are required, the test holes should be made in rigid ductwork.

DW 144: Specification for Sheet Metal Ductwork

Flexible ducts shall be securely fastened at each end using a proprietary band such as a plastic tie-wrap. The load-bearing capacity of the construction can be assumed for a specific period of time.

In contrast to international standardization, it can have a standarf role in certain cases. Fusion welding of steel. In describing flat oval ductwork, the major axis is referred to as the width W and the minor axis is referred to as the depth D For tie rod requirements see Tables 13 and Kitchen extract ductwork presents a particular hazard as combustible deposits such as grease are likely to accumulate on d144 surfaces, therefore all internal surfaces of the duct must be smooth.

Forming and general characteristics are similar to the 1.

DW Specification for Sheet Metal Ductwork – The BESA

Find out more about how BESA can help your business and the benefits available to members. Non-combustibility test for materials.

Typical examples of the various methods of fixing to a structure are shown in Dw44. In choosing a temper, it is necessary to consider any forming that will stqndard done, as with the harder tempers the forming of tight bends might cause cracking.


Share Share Share An opportunity to contribute your knowledge to a number of key industry focus areas Read More. Additional tests will also be required if the classification covers a.

Don’t Forget – TR/19 states that you will need a

Stanfard, health and the environment. If it requires long lengths of lined duct to achieve the reduction in sound level then the proprietary attenuator becomes an economic alternative. Used for simple operations and designed up to mm on the longest side. With all flanged joints, the stanndard of sheet and section should preferably be incorporated during construction at works, stxndard site applied sealant is acceptable.

Sheet, strip and plate. Such fixings must not be used within 1 metre of an access opening — as BS Enclause 4. The CPR becomes a statutory requirement in each European country tsandard it is incorporated in national Building Regulations. Alternative sealant locations Fastening Alternative sealant locations Sealant shall be applied either internally or externally to the seam edge or internal to the joint seam itself. Tolerances on dimensions and shape.

BS EN Ventilation for buildings. Having considered the scope and the design of the ductwork system relative to the guidelines outlined in J. 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.

Duties dw144 placed upon clients, system designers and contractors with more power given to the CDM Co-ordinator who has a more authorative and policing role. Tata Steel are able to provide further detailed information on the subject of coil ew144 recommendations and practices on their website. Please fill this form, we will try to respond as soon as possible. Design Notes for Ductwork TM Where successive failures are identified there shall be a right to require the ductwork contractor to apply remedial attention to the complete ductwork system.


Method 2 Protection using fire resisting enclosures Method 3 Protection using fire resisting ductwork 4.

No paint protection is required. En, grade FEP 01A. To create this path there must be ducts and the smoke extract path must remain uninterrupted. If the material has been stored outside at low temperature, a warm-up period should be allowed before forming of the sheet is undertaken. Larger distances between floors than 5m. The ductwork manufacturer will provide a roof skirt cravat to cover the roof kerb and this should be of either a fully welded construction or have seams sealed with a polysulphide sealant or similar.

L 17 or The blades shall be simultaneously adjusted by a quadrant or similar operating mechanism. The Commissioning Codes give a guide to design implications. Heat loss from and dw44 to air in the duct; condensation, noise control and fire.

It is suitable for a range of ducting and structural applications in mildly corrosive applications.

This is applicable only to four-sided rectangular and circular duct. BS EN Fire classification of construction products and building elements.

The smoke duct also standadd to be tested as fire inside duct C. A widely used grade of this type is designation 1. EN lists the grades of steel set out in the columns below, among others: Sealants, gaskets and flexible joints should be tested and certificated standarv accordance with the appropriate test standard and comply with all manufacturers recommendations. Arrangements of circular supports for plain and insulated ducts are shown in Figs.

The extracts from BS. Some proprietary systems of support for vapour sealed ducts are available. The blades shall close the airway by means of a spring sthe spring element being incorporated within the damper or actuator mechanism.