(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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HVCA DW – Free Download PDF

Using suitable precautions when handling, transporting and installing the da144 will help to minimise un-necessary damage.

Where automatic control of the damper is required a spindle shall be extended to enable a powered actuator to be mounted. In this case, there is increased risk of formation of corrosion products on the surface during storage and transportation.

It should be noted that all the regulations and orders are the law, not just guidance. No individual damper blade should exceed mm in width. Commentary and Guidance — Note 4.

Classification using test data from reaction to fire tests. A fire in an adjacent compartment through which the ductwork passes, could lead to ignition of the grease deposits, which may continue through the ductwork system, possibly prejudicing the safety of the kitchen occupants.


Typical examples of the various methods of fixing to a structure are shown in Figs. Procedures for the selection of all employees and sub-contractors need to be set down with requirements for items such as personnel protection equipment, skill cards, method statements, risk-based assessments, insurances and the safety document. Dampers shall have casing leakage classes to meet BS EN The surface has minimized spangles obtained by influencing the solidification process in a specific way.


Fire tests on building materials and structures. The Director is not usually responsible for the physical updating of company knowledge on legislation, more often this is the role of a safety professional.

DW Specification for Sheet Metal Ductwork – The BESA

The composition and processing is usually adjusted by the manufacturer to balance forming response, weldability and corrosion resistance. Classification symbols defining BS EN Parts 1, 8 or 9 tests that have been carried out and the suitability of the duct used for particular applications. The site storage of ductwork also introduces the additional important consideration of maintaining any factory applied protection and the internal cleanliness of the ductwork.

A uniform matt finish. In the knowledge that it is easier to prevent white rust than to remove it, components should be stored in a clean, dry area. Standard Title BS EN Extended application of results from fire resistance tests for service installations – Ducts prEN Extended application of results from fire resistance tests for service installations — Smoke control ducts Reference Ducts for ventilation, pressurisation and kitchen extract Smoke control ducts etc.

Dw14 help us to share our service with your friends. Distortion shall be kept to a minimum. The Regulations place duties on all those who can contribute to the health and safety of a construction project.

A lustrous unidirectional finish produced by fine grinding, generally with abrasives of grit size. BS EN Welding consumables. If particles such as filings or grinding dust of a non-stainless steel or iron standaard brought into contact with a Stainless Steel, subsequent exposure to moisture will lead to staining of the surface as these particles rust.


In view of the foregoing, it is recommended that trials be carried out before starting production. Employment Affairs Expert guidance available on a range of employment issues Read More. Wet storage staining are the white and dark stains which may be seen on the surfaces of newly galvanized components when they are closely stacked and stored or transported under damp conditions.

A smooth finish brighter than 2D. They cannot be used to support CE marking of construction products, which becomes mandatory from 1 July where a harmonised hEN product standard is in place. Wire electrodes, strip electrodes, wires and rods for arc welding of stainless and heat resisting steels.

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


BS EN Smoke and heat control systems. Sustainability Browse our range of good practice sustainability guides Read More. Occupants can leave the construction standarf or be rescued by other means. Since European standards have run alongside the British Standard Part Before duct manufacture it should be clarified that specified external duct dimensions allow for the lining thickness.

It is not practical to cover the full range of fixing available, therefore any propriety fixing can be considered if substantiated with manufacturers test data.

It is expected that any other abbreviations used are separately defined when used in specifications, drawings, etc.