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www.heatingandventilating.net


C t t h b Contractor hub


flue could be used to benefit the installation, for instance ‘landlocked’ flats. These types of properties lack sufficient external wall space for the flue termination to be placed; for example, there may be a balcony or windows near where the flue termination would normally be. This means a longer flue will be needed to extend towards the roof for the combustion gases.


There are also certain properties that have additional legislation to consider regarding flue runs, such as listed buildings. There are over 500,000 such properties in the UK which are protected so that they are preserved for future generations. Amongst many other regulations, there are some that would affect the flue run. Flues cannot be positioned in front of the property or any part that would be seen from a highway, meaning that a more flexible flue solution will be needed to meet the requirements. There are a number of benefits to using twin flues. Ultimately, the preferred outcome for the customer is cost savings, across both gas bills and installation. One of the benefits for twin flue installations would be the cost difference. Twin flue boiler installations require manufacturer approved, small diameter (50mm) muPVC (PVC-C) solvent weld pipes, one for the air duct and one for the combustion gases. This solvent weld pipe is sold at a fraction of the price when compared to proprietary concentric flue systems.


It is also advantageous to retrofit existing twin flue installations rather than moving a boiler to fit a concentric flue. If the original boiler position was within an area that did not have straight access to an external wall, the consideration of moving the boiler, gas and water pipework and flue runs to suit a concentric system would not need to be taken into account. As a retrofit replacement a twin flue solution would be far simpler.


other than manufacturer approved push-on or plastic compression connectors are made and sealed with solvent cement suitable for the manufacturer approved muPVC (PVC-C) flues conforming to BS 6209.


British built since 2013 Keston Boilers


offer heating solutions for both domestic and commercial installations, with unique twin flue capabilities that offer heating solutions without compromise. Free training is available at the Training Centre of Excellence sites in Hull, Leeds and Reading.


When using a twin flue system there are some additional measures that need to be considered, such as the Corgi/Gas Safe technical bulletin TB200/TB008 regarding flues in voids. Where boilers are located away from an external wall the flues are likely to run through the ceiling or wall voids. In these cases, inspection hatches have required to be installed at appropriate points along the flue runs to ensure safety checks can be completed. The inspection hatches are intended to allow visual inspection of the concealed system rather than having full physical access. To ensure flues can be examined thoroughly, inspection hatches should be 300mm by 300mm in size and no flue joint within the void should be more than 1.5m away from the edge of the nearest inspection hatch. Making space for these hatches could mean additional remedial work would need to be done, such as added plastering after the hatches have been completed. There are other elements that need to be considered outside of BS 5440-1: 2008. All flues need to be adequately supported and all joints


There are many types of installations that would reap the benefits of twin flue systems, such as those in pubs, care homes and landlocked flats. Many of these types of building require a longer than average flue length, which could be determined by the original location of the boiler. Twin flue systems are more cost and time effective for these boiler positions than concentric systems, while also complying with flue termination regulations. They offer a unique resolution for installers with tricky heating solutions.


www.heatingandventilating.net


February 2020


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