#DW144 STANDARD FULL#
It is not practicable to deal here with the full range of supports available, which increasingly includes proprietary types such as wire rope suspension systems, so in this section various methods of support are dealt with in principle under the three elements of: Fire brigades will seek changes under this legislation if they find discrepancies and will start court proceedings if they find major problems that have not been put right. Building products excluding floorings exposed to the thermal attack by a single burning item. Typical materials are hardwood or treated softwood srandard separate block form for circular ducts - see note below: The requirements for flat oval duct fittings apply throughout the pressure ranges covered in this standrd. The test standard for single compartment smoke control duct is BS EN BS EN Continuously hot-dip zinc coated low carbon steels strip and sheet for cold forming. Supports for ductwork external to the building have been excluded, as these are individually designed to suit the circumstances, and also may be required to meet local authority standards. ADB gives guidance on fire safety information if required at building completion or occupation – whichever is earlier.
Generally they are called for where ducts penetrate walls or floors which form fire compartmentation. The load-bearing capacity of the construction can be staandard for a specific period of time. Stainless Steel also finds application in exposed ductwork where the finish can be used for aesthetic reasons. Dampers that are designed to fail open using a thermal operating element at the outside of the building or in a collection area may be used, noting that once this device has operated, the unit ceases to be under the control of the system as its ds144 may not be reversed by the system.įixing bolts required at each corner and at mm centres.įire dampers must not be installed in extract ductwork serving car parks, however smoke control dampers could be used. The Regulations place duties on all those who can contribute to the health and safety of a construction project. Tolerances, dimensions and sectional properties. The ductwork contractor shall provide documented evidence of the calculations used to arrive at the allowable loss for the section to be tested and the client, or his agent, shall witness and sign the results of the test. Curtain fire dampers generally provide an E classification to BS ENas they do not have the cold leakage characteristics to achieve the ES classification. The CPR builds on the success of the CPD, by allowing construction products that have been assessed standarv harmonised standards to be legally placed on the market anywhere in the European Economic Area. The design of swimming pool ductwork systems and their supports is the responsibility of the system designer and not the ductwork contractor. The implementation of an Environmental Management System EMS can assist a business in managing and meeting its increasingly heavy burden of responsibility for the future protection of the global environment. Care shall be taken to ensure that the integrity of any vapour seal is maintained and reference in this respect must be made to both BS and BS It may be necessary to provide additional protective sheeting to stored ductwork to ensure the factory applied protection and cleanliness requirements remain in place. Some proprietary systems of support for vapour sealed ducts are available. DW Specification for Sheet Metal Ductwork – The BESA Aerodynamic testing of dampers and valves. The choice between the available methods of fixing will depend on the type of building structure and on any limitations imposed by the structural design. Low, medium and high has gained national and international recognition as the industry standard. 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. (a) DW/ Specification for sheet metal ductwork (low-medium- and high pressure).
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