With over 20 years of experience in condensing boiler technology, and as a result of many years of research and development in flue systems to cover the 14 different countries where our boilers are installed, we also have numerous flue applications to suit many different situations.

• Standard fan assisted concentric balanced flue.
• Vertical and horizontal concentric extended flues (Max height 10m inc 2 no. 45° bends)
• Twin pipe flue system with separate air and flue pipes for lengths in excess of 10m.
• Polypropylene liner systems for chimney applications.
• Our ‘Cascade’ system, which uses our non-return valve and allows several boilers to be connected together on a horizontal or vertical riser.
• The ‘Vertical Cascade’ system means that the number of flue exits on a multi dwelling building can be dramatically reduced; this is particularly suitable for high rise developments.
• High-tech external stainless steel systems with internal polypropylene for the modern building.
• Bespoke flue design service to overcome any on-site problems and to ensure that our boilers are working at their most efficient. At Geminox-UK we ensure that our flue systems do not restrict the boiler performance or reduce the lifespan of our combustion fan.

The ‘Vertical Cascade’ system is a tried and proven product and we have been using this system for many years in our other European partner countries. The development of the ‘Vertical Cascade’ is a result of restrictions in countries such as Holland, where 98% of the boiler market is condensing, and Germany and Switzerland, which do not allow a flue to be discharged at low level if the appliance has an output greater than 3Kw. Due to these restrictions, flue systems were developed to always enable the flue to be discharged at high level and to prevent multiple flue exits through the roof. A system therefore had to be developed to enable it to connect to a number of appliances, but also for those appliance to remain room sealed.

Our vertical cascade flue system allows a multiple of boiler flue discharges to be connected into one common riser running up through a chimney or service shaft in the fabric of the building, but still allowing the boiler to remain room sealed. This makes it ideal for high-rise properties or buildings with glass facades where it is essential to maintain the aesthetics of the building.

The discharge from the boilers runs up through the centre of the service shaft terminating vertically through the top of the building. Our roof terminal allows fresh air to be drawn into the service shaft and delivered to a concentric wall adaptor at the point of entry to each dwelling. Each boiler is fitted with our non-return valve isolating it from the riser when not in use.

Unlike some manufacturers Geminox do not want the fan to be overworked to overcome the resistance of the flue, neither do we allow the boiler power to be reduced by excessive flue runs. The built in microprocessor in our boilers enables the parameters and fan speed to be adjusted to ensure each boiler on the riser runs at its optimum efficiency.

The vertical cascade flue system is available off the shelf for a development up to 11 boilers over 11 storeys and can be custom designed for applications greater than this. The flue riser consists of a 200mm x 200mm internal measurement service shaft with a 110mm flue riser running vertically through it, picking up a boiler on each level.