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Contractor hub Contractor hub C t t h b


www.heatingandventilating.net


Finding the right flue remedies


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Boiler installations can present a number of challenges for installers, as not all are the same. There are many elements that need to be considered such as the boiler position, flue termination and regulations regarding the property to name a few. Charlie Mowbray, product manager at Keston Boilers looks into how twin flue boiler systems can offer a solution to installations that require a longer flue run.


T


here are many types of installations that would reap the benefits of twin flue systems, such as those in


landlocked flats. Many


npubs,carehomesand yofthesetypesofbuilding


require a longer than average flue length, which could be determined b


by the original location of the


boiler. Keston Boilers is able to run its flues up to 27 metres allowing fle The flexibility this leng to be positioned in loca


concentrically directly through an external wall, such as those in a basement room. Fluing requirements


sforboilersnotexceeding


70kW are detailed in British Standard BS5440-1: 2008 and provides guid


dance on what is essentially


the main function of flu etermination,namelythatthe products of combustion to the outside air in a sa needs to be positioned a surrounding features on to prevent any debris ge could have an effect to t details are outlined with installation guides whic of the appliance and pre causing detriment to others. The vast majority of d with a concentric flue sy


nareeffectively discharged afe location. Any termination appropriately with respect to nthebuildinganddesigned etting into the system that the performance. Relevant hin the boiler manufacturers’ ch ensure the safe operation event the position of the flue


different way to install boilers as it allow


domestic boilers are designed ystem where the air supply


and flue gases are managed within one flue. They are designed as a duct within a duct, with the exhaust gases taken away through the inner duct and the combustion air drawn i nthroughtheouterduct. Installations that use a concentric flue system can be installed vertically whenleavingthroughtheroof,or horizontally leaving through a wall. Twin flue boiler syst


w


–theyrunseparately. installation the flues d an air intake and an ex further flexibility in dis task as concentric sys y


!" Apr l 2020 April 2020i


This type of system offers a onotrunwithinoneanother xhaust flue, but in a twin flue stance. Both systems have tems; however, they do allow p


tems will perform the same ws furtherwsfurther


options to where the flue runs can go. F or example, the twin flue runs are not restricted to run parallel, meaning that the air position will not be limited by the same restrictions placed on the term


mination


of the combustion flue. This added benefit means the combustion gas pipe can run further


rtothe


desired termination point while the air pipe can run ough the nearest external wall next t emaximumcombinedlengthforboth ston boiler is 27 metres in total. So, fo


Kes The thro


, p


the air flue can be terminated three metres away from


mtheboilerallowingtheremaining2 left for the exhaust flue run.


com T


Twin flue systems will offer a solution mplicated boiler installations, for inst


ance if nfor


24 metres


or example hfluesona otheboiler.


the boiler placement is in the basement of the property. Historically kitchens across the U


y, boilers were installed in UK. This stems from the days


when kitchens were situated in the basement of houses. Heating hom over time, originating


ame, within the basement. q


mes in the UK has developed gfromtheuseofwood,then


coal and eventually t onaturalgas.Duringthese changes to fuel type, the position of the boiler may have remained the sa


Basement boiler installations require a longer boiler flue to meet th


termination. Rather than dealing with the additional work and cost of mov


he requirements for flue t


ving the boiler position, twin


flue solutions can be used to give the extra length that is needed without any hassle. There are also cer


rtain properties where twin www.heatingandventilating.net www.heatingandventilating.net


exibility on the boiler position. gth provides allows for boilers ations that cannot be flued


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