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unimpeded flow path to the top of the flue that maintains the temperature of the gases above the dew point. Effective and continuous insulation is a key part in maintaining flue gas temperature. Chimney and flue standards are there to specify the components that should be used and how they should be used to achieve this primary function. Chimneys and flues are required to discharge a variety of combustion gases, and different types of flue will be required to safely handle the different gases. A key feature of the chimney and flue standards is a user-readable classification system that designates the features of the flue components. The features covered include temperature and pressure rating, fire rating, condensate and corrosion resistance and distance to combustibles. With stainless steel and plastic flues a label showing the classification must be delivered with each flue component, so that the product’s specification can be easily verified. It is important, for example, to use a condensing flue with a condensing appliance and the designation will help you do this.
Product testing
Product testing is the backbone of setting standards. Chimney and flue components are rigorously tested by approved test houses to prove that they can safely
meet the required performance. In addition to this, most chimney and flue companies use simulation software to confirm that a system chimney or flue will function as specified. If in doubt about the effectiveness your chimney design, talk to the chimney or flue manufacturer about a chimney or flue simulation.
System chimneys
Product standards and CA marking will apply to both flue components and to system chimneys. It is worth pointing out that a CE or UKCA mark for a system chimney applies to the complete flue system, including additional components like rain caps. The use of components that have not been tested with the system will invalidate the CE or CA mark and turns the system into a custom flue. As a custom flue the manufacturer’s system chimney guarantee is no long valid.
Design and installation guides
In addition to establishing standards, the BFCMA has also produced a number of design and installation guides covering wood burning and multi-fuel stoves, biomass appliances, gas appliances and commercial flues. The latest guide covers gas appliances. The
Chimneys & flues
guides can be downloaded from the BFCMA website. The design and installation of chimneys and flues in the residential sector are covered by Approved Document J. However, the update of Document J is long overdue. The BFCMA guides contain information on the latest standards and allowed installation practices. Recently published up to date information may not be included in Document J. For example, the UK Annex to BS EN15287-1: Design, installation and commissioning of chimneys contains the approved alternative installation methods for stoves that can overcome a number of on-site difficulties. These are covered in detail in the BFCMA guide for solid fuel and wood burning appliances.
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