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 | | NEW VERTICAL AIR FLUE SYSTEM FOR MULTI-STOREY BUILDINGS ADDED TO BRITISH STANDARD | | | BSI | | 14/07/2008 | | | BSI British Standards has now incorporated into the revised BS 5440-1 the new vertical air flue system for multi-storey buildings, a UK first for this type of flue. As a result, Cox Geelen BV’s Communal Flue System, (CFS) which is available through Atmos in the UK, is now in line with British Standards.
BSI British Standards undertook the revision of BS 5440-1:2008 Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases), to cover recent developments in appliance design; to bring the standard in line with Building Regulations; redefine chimney concepts in line with terminology used across Europe and improve advice on flueing and ventilation practices.
The Dutch manufactured CFS shared vertical air flue system is already proven on numerous developments over the past 25 years in the Benelux countries, where it has solved the problem of tricky condensing boiler positionings in multi-storey buildings. Conventional SE ducts typically used on multi-storey buildings are not suitable for condensing boilers, but thanks to the Communal Flue System, available through Atmos, condensing gas boilers can now be fitted in blocks of flats or similar projects, ensuring installers, public sector specifiers and developers meet the highest required energy efficiency standard.
Each CFS stack can handle up to 24 boilers, delivering combustion air and providing for the efficient discharge of flue products, thus eliminating unsightly pluming effects from the side of a building. With the new HSE/CORGI regulations which make horizontal internal flue runs very difficult, the CFS system is a vertical solution which permits the boiler to be located away from the outside wall. Ideal for new build projects, the CFS can also be used as a retrofit solution for developments already equipped with an SE duct system, so enabling standard boilers to be replaced with high efficiency condensing units.
John Thomason, General Manager of Atmos explains: “We are delighted that this new type of vertical flue has been added to BS 5440, a UK first for this new type of vertical flue. One of the bug bears with condensing boilers, particularly for local authorities, is that they cannot be connected to existing SE ducts typically used on multi-storey buildings, making it difficult to site the new boiler. However, the CFS enables easy installation of condensing boilers, thereby dramatically reducing the building’s carbon footprint. The Atmos range of boilers goes one step further, as they are certified for use with the positive pressure Communal Flue System, which reduces the diameter of the stack, thus saving valuable space and reducing the roof terminal size”
British Standard BS 5440 advises engineers on the specification for installation of gas appliances to chimneys and for maintenance of chimneys. This includes the selection of appropriate flue options for gas appliances in the UK as well as requirements for the installation of gas appliances to new and existing chimneys or chimney configurations.
The new CFS brochure from Atmos illustrates the various configurations available, including the naturally vented, or the more compact positive pressure system. The naturally vented system works with condensing, non-condensing or a mixture, and will add a new flexibility to gas boiler installations in multi storey buildings and therefore contribute positively to carbon savings across the country. | |
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