• June 15, 2019

(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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The full titles have not always been used. 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.

Swimming pool buildings have the additional complication of a large variations in conditions which can exist in a pool environment. A fixing must be made in such a way that it cannot become loose or pull out through normal stressing or through normal changes in the building structure. Additional tests will also be required if the classification covers a. The length of such flexible ducts should be kept to a minimum consistent with the particular application.

It also contains updated information on hangers and supports, smoke and fire dampers, external ductwork, internal duct linings, thermal insulation, air terminal units, with many clear reference tables.


The surface finish is just as critical in determining the corrosion resistance of Stainless Steel as the grade. The Regulations place duties on all those who can contribute to the health and safety of a construction project. Splitters shall be attached to the duct by appropriate fastenings at mm maximum spacing or by such other fixing as can be shown to be equally satisfactory e. Safety in case of fire. Kitchen extract ductwork presents a particular hazard as combustible deposits such as grease are likely to accumulate on internal surfaces, therefore all internal surfaces of the duct must be smooth.


My Details View and edit your details Read More. Whilst stnadard of the information may now be superseded, TM8 includes chapters on: Flexible joint connections are manufactured by specialists from the specified material as plain sleeves or sleeves with flanges at one or both ends.

The designated Director has the overall responsibility for ensuring that company knowledge is updated on current legislation, guidelines and codes of practice, and the dissemination of this information to employees and sub-contractors. A bright, non-directional reflective finish with a high degree of image clarity. More highly alloyed grades of Stainless Steel with enhanced corrosion resistance are available if required.

Minimum stanrard thicknesses related to duct diameter are given in tables 8, 9 and fw144 Tolerances, dimensions and sectional properties. It may be necessary to provide additional protective sheeting to stored ductwork to ensure the factory applied protection and cleanliness requirements remain in place.

However, stzndard on specific corrosion risks should dd144 taken if stadard ductwork is to be installed in a chemically contaminated atmosphere, or is to be used to transport contaminated air, particularly if there is a risk of internal condensation. If required, in the event of a signal from a remote sensor the fire damper blades shall be released and close the airway.

Fixings and fastenings should be of the appropriate grade of Stainless Steel as used in the construction of the ductwork. This is applicable only to four-sided rectangular and circular duct.

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

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. Test results achieved for vertical ducts A and B are applicable to vertical ducts only.


En, grade FEP 01A. It is particularly important that such a panel is accommodated for the inspection of bird mesh screens fitted behind louvres. If consideration is being given to either higher pressures or flat oval sw144 then it would be prudent for the system designer to seek advice from manufacturers who have the experience and capacity to manufacture aluminium ductwork.

HVCA DW – Free Download PDF

A uniform matt finish. BS EN Specification for hot-rolled flat products made of high yield strength steels for cold parts forming. We firmly believe that this process has resulted in a publication that clearly demonstrates the high level of professionalism which exists within the ductwork community — and we take this opportunity of thanking all those who have contributed to its production.

Fire resistant ductwork covered by Product Standard prEN will Within F of the standard is qualified t require mandatory mark. Welding with conventional equipment should not be attempted.

Failure of the suspension devices does not constitute failure of the test specimen unless it leads to failure of either E or EI. These are; 1 2 3 4 Insulation Integrity Smoke leakage Stability Direct field of application The direct field of application only covers circular and four sided rectangular ducting at this time. Certain people may have defined roles; it is these people who should be identified within the organizational chart along with their role.

Table 20 that follows, summarises these da144 under the heading of those panels to be fitted by the ductwork contractor.