The location of the boiler and flue system in apartment blocks can often prove to be a source of consternation for installers. With safety and compliance with the Gas Safety (Installation and Use) Regulations (GSIUR) 1998 being paramount, choosing the right flue in such buildings is vital.
Safety is the primary consideration but following the GSIUR guidelines doesn’t have to mean a compromise in boiler location.
The advantage of longer length flueing systems is the siting flexibility of the boiler. It enables the installers and building designers to place the boiler in the most convenient location - which isn’t always an exterior wall, especially in tall blocks of flats.
Standard flues are often 1-2 metres in length and require several joints that fasten together with push/fit method. The introduction of extended twin and concentric flues has encouraged the practice of passing flues through ceiling voids and roof spaces in order to site the boiler in a convenient location.
The whole length of the flue system must be accessible for visible inspection, both at commissioning and annual service, to check for degradation and leaking joints. Reducing the number of joints in the flue system minimises the risk of separation and the number of inspection points required.
It’s also important that the flue is supported throughout its length to prevent sagging which places pressure on the joints. Extended flue systems provide a solution that meets all the GSIUR requirements.
Incorrect installations may put occupants at risk of leaking CO2, so it’s important the installers follow manufacturer guidelines to the letter. Achieving optimum safety and versatility is the best of both worlds when fitting heating systems in tall buildings.
John Forster is sales and marketing director of Keston Boilers