CoxHYBRID<sup>®</sup> CFS PP
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CoxHYBRID CFS PP system

Renovation of communal flue systems

The replacement of old boilers plus replacing the collective flue gas: sooner or later every Association of Owners will have to deal with it. Many Association of Owners fear the high costs and the major nuisance for residents involved. In addition to the inconvenience and clutter of the demolition work, the residents sometimes suffer days without hot water and heating.
There must be a better way! Cox Geelen developed a plastic flue gas exhaust system that can be installed from the roof by lowering pipe sections through the existing shaft, flue gas or ventilation duct.

How does it work?

A multi-storey apartment building usually has several shafts or shared system chimneys. Renovation is carried out one shaft at the time.
  • Each shared chimney can be completely renovated in 1 day.
  • All apartments that are connected to such a shaft are fitted with a new high-efficiency condensing boiler.
  • At the end of the day all heating boilers are connected to the CoxHYBRID flue® system, including a new roof terminal on the roof.
  • Duct by duct, the entire building is equipped with new appliances.
  • To get acquainted with the system, we recommend that you watch the video.



When should a gas flue shared system be replaced?
In general all communal flue systems (CFS) from before 2005 need to be replaced. There are 2 reasons for this.
A first, a very important reason is that pre-2005 systems lack the sealing technology (silicone seal) in the flue gas discharge pipe that is necessary to convert an underpressure system into an overpressure CFS system.
The other reason is that, prior to 1992, CFS systems, regardless of their manufacture, are not CE certified and therefore these CFS systems need to be replaced as well.

Points of consideration

  • Multi-storey residential building with floor height from 2.6 m to 3.1 m.
  • All old boilers must be replaced by modern condensing devices at the same time per shared chimney.
  • No bends or narrow sections in the shaft.
  • Width of the chimney or pipe. The CoxHYBRID® PP CLV system (diameter Ø 130 mm or Ø 180 mm) must fit into the existing shaft.

Renovated apartment buildings

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More information or would you like to receive advice on an upcoming project? Call +31 43 40 99 500 or mail us. Our specialists look forward advising you about the possibilities.

Projects:

Location Arnhem: The entire job (59 residential units), including the replacement of the heating boilers, was completed in two days.

CoxHYBRID® instruction video




Collective flue gas renovation system CoxHYBRID® CFS PP

CoxHYBRID® CFS PP is an innovative overpressure CFS system developed in Cox Geelen's own Research & Development center in close collaboration with installation companies at home and abroad. With this innovative solution, old shafts or existing shared chimney systems in multi storey housing can be quickly and easily made suitable for connecting modern condensing boilers.
Due to the corrosive environment Polypropylene (PP) and stainless steel are the safest materials to use. The CoxHYBRID® PP CFS system is lightweight and is quick and easy to install. The sections used to create the replacement chimney, have flexibility built-in providing the adjustment needed to accommodate different floor to floor heights, so eliminating the need for cutting on site. The major issue with any retrofit is the management of the condensate produced by modern high efficiency appliances. There is no problem if there is no facility to provide a drain facility for the condensate. The condensate can be easily discharged through the flue pipe to the boiler. A complete CoxHYBRID® CFS PP stack is made up only of a few standard parts, namely a roof terminal, a roof mounting plate, a number of repeating pipe sections and a base unit.
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CoxHYBRID® Fire-rated wall plates


Recently the CoxHYBRID® program has been further extended. Cox Geelen introduced new round fireproof wall plates with integrated fire seal. These innovative wall plates are designed for connection to flexible and concentric flue material. A fixed gradiant of 3° was included in the design for drainage of condensate towards the heating appliance. These revolutionary wall plates ensure a fire and carbon monoxide safe situation in the house. 
Cox Geelen's wall plates are flame-proof as well as heat insulating, a must-have for flue gas and chimney renovations! By installing a fire-resistant wall plate over the opening in the shaft, the flue gas discharge and air supply are restored to at least the same fire resistance requirements as the shaft wall itself.

CoxHYBRID® wall plates

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Application

The CoxHYBRID® CFS PP system is designed for the renovation of old gas flue ducts (Shared System Chimneys) in multi-storey residential buildings enabling the connection of suitable gas-fired condensing appliances (T120). As no major engineering re-work is necessary in the building the residents experience minimum disruption during the installation.

The following Shared System Chimneys originally designed for dry flue gases (non-condensing SE boilers) can be renovated with CoxHYBRID®:
  • Spiral wrap metal seamed chimneys.
  • Architectural masonry chimneys.
  • Shared structural chimneys, for example Shunt, SE-Duct, U-Duct.
  • Aluminium and Stainless Steel CFS systems.
Besides being used in renovation projects, the CoxHYBRID® CFS PP system can also easily be used as a single-walled positive pressure CFS system in new housing developments.

Diameter

The CoxHYBRID® CFS PP system is available in Ø 130 mm and Ø 180 mm.

Approval

CE marked according to EN 14471.

Recyclable

At the end of its life span the CoxHYBRID® CFS PP system can be entirely recycled. The use of recyclable plastics contributes to a more sustainable and greener environment.

Information

Safety - Carbon monoxide poisoning prevention

The dangers of carbon monoxide: Understated and misunderstood